diff --git a/lib/SimpleSAML/Module.php b/lib/SimpleSAML/Module.php
index b5d8f0245c6fc69490f3c971c4479ce2e2ade3c1..829fa7b1182a2bf51c2d98d2ec2c7274bde11ebe 100644
--- a/lib/SimpleSAML/Module.php
+++ b/lib/SimpleSAML/Module.php
@@ -157,7 +157,7 @@ class SimpleSAML_Module {
 
 		$url = SimpleSAML_Utilities::getBaseURL() . 'module.php/' . $resource;
 		if (!empty($parameters)) {
-			$url = SimpleSAML_Utilities::addURLparameter($url, $parameters);
+			$url = \SimpleSAML\Utils\HTTP::addURLParameters($url, $parameters);
 		}
 		return $url;
 	}
diff --git a/lib/SimpleSAML/Utilities.php b/lib/SimpleSAML/Utilities.php
index a0dab57b64513302ddb1bb079ac4985b71dd25bb..334f5846bc3d4c23300d56e5f1299595da1255e8 100644
--- a/lib/SimpleSAML/Utilities.php
+++ b/lib/SimpleSAML/Utilities.php
@@ -252,48 +252,10 @@ class SimpleSAML_Utilities {
 
 
 	/**
-	 * Add one or more query parameters to the given URL.
-	 *
-	 * @param $url  The URL the query parameters should be added to.
-	 * @param $parameter  The query parameters which should be added to the url. This should be
-	 *                    an associative array. For backwards comaptibility, it can also be a
-	 *                    query string representing the new parameters. This will write a warning
-	 *                    to the log.
-	 * @return The URL with the new query parameters.
-	 */
-	public static function addURLparameter($url, $parameter) {
-
-		/* For backwards compatibility - allow $parameter to be a string. */
-		if(is_string($parameter)) {
-			/* Print warning to log. */
-			$backtrace = debug_backtrace();
-			$where = $backtrace[0]['file'] . ':' . $backtrace[0]['line'];
-			SimpleSAML_Logger::warning(
-				'Deprecated use of SimpleSAML_Utilities::addURLparameter at ' .	$where .
-				'. The parameter "$parameter" should now be an array, but a string was passed.');
-
-			$parameter = self::parseQueryString($parameter);
-		}
-		assert('is_array($parameter)');
-
-		$queryStart = strpos($url, '?');
-		if($queryStart === FALSE) {
-			$oldQuery = array();
-			$url .= '?';
-		} else {
-			$oldQuery = substr($url, $queryStart + 1);
-			if($oldQuery === FALSE) {
-				$oldQuery = array();
-			} else {
-				$oldQuery = self::parseQueryString($oldQuery);
-			}
-			$url = substr($url, 0, $queryStart + 1);
-		}
-
-		$query = array_merge($oldQuery, $parameter);
-		$url .= http_build_query($query, '', '&');
-
-		return $url;
+	 * @deprecated This method will be removed in SSP 2.0. Please use SimpleSAML\Utils\HTTP::addURLParameters() instead.
+	 */
+	public static function addURLparameter($url, $parameters) {
+		return \SimpleSAML\Utils\HTTP::addURLParameter($url, $parameters);
 	}
 
 
diff --git a/lib/SimpleSAML/Utils/HTTP.php b/lib/SimpleSAML/Utils/HTTP.php
index d501162af742f2a86f7cf4b7fe9b0e08cb019395..bf7ac0c4520bc09779f180ba19495c2419ca4780 100644
--- a/lib/SimpleSAML/Utils/HTTP.php
+++ b/lib/SimpleSAML/Utils/HTTP.php
@@ -65,6 +65,46 @@ class HTTP
     }
 
 
+    /**
+     * Add one or more query parameters to the given URL.
+     *
+     * @param string $url The URL the query parameters should be added to.
+     * @param array  $parameters The query parameters which should be added to the url. This should be an associative
+     *     array.
+     *
+     * @return string The URL with the new query parameters.
+     * @throws \SimpleSAML_Error_Exception If $url is not a string or $parameters is not an array.
+     *
+     * @author Andreas Solberg, UNINETT AS <andreas.solberg@uninett.no>
+     * @author Olav Morken, UNINETT AS <olav.morken@uninett.no>
+     */
+    public static function addURLParameters($url, $parameters)
+    {
+        if (!is_string($url) || !is_array($parameters)) {
+            throw new \SimpleSAML_Error_Exception('Invalid input parameters.');
+        }
+
+        $queryStart = strpos($url, '?');
+        if ($queryStart === false) {
+            $oldQuery = array();
+            $url .= '?';
+        } else {
+            $oldQuery = substr($url, $queryStart + 1);
+            if ($oldQuery === false) {
+                $oldQuery = array();
+            } else {
+                $oldQuery = self::parseQueryString($oldQuery);
+            }
+            $url = substr($url, 0, $queryStart + 1);
+        }
+
+        $query = array_merge($oldQuery, $parameters);
+        $url .= http_build_query($query, '', '&');
+
+        return $url;
+    }
+
+
     /**
      * Retrieve the port number from $_SERVER environment variables.
      *
@@ -107,7 +147,7 @@ class HTTP
     public static function parseQueryString($query_string)
     {
         if (!is_string($query_string)) {
-            throw new \SimpleSAML_Error_Exception('Invalid input parameters');
+            throw new \SimpleSAML_Error_Exception('Invalid input parameters.');
         }
 
         $res = array();
diff --git a/modules/aselect/lib/Auth/Source/aselect.php b/modules/aselect/lib/Auth/Source/aselect.php
index 874b5ca72e2d4794bf4038380ea74e033dd52ca8..fca98969368e70a8d2455ca5a0cc734a8484d195 100644
--- a/modules/aselect/lib/Auth/Source/aselect.php
+++ b/modules/aselect/lib/Auth/Source/aselect.php
@@ -125,7 +125,7 @@ class sspmod_aselect_Auth_Source_aselect extends SimpleSAML_Auth_Source {
 					$signable .= $parameters[$p];
 			$parameters['signature'] = $this->base64_signature($signable);
 		}
-		return SimpleSAML_Utilities::addURLparameter($this->server_url, $parameters);
+		return \SimpleSAML\Utils\HTTP::addURLParameters($this->server_url, $parameters);
 	}
 
 	/**
@@ -177,7 +177,7 @@ class sspmod_aselect_Auth_Source_aselect extends SimpleSAML_Auth_Source {
 		$as_url = $res['as_url'];
 		unset($res['as_url']);
 
-		return SimpleSAML_Utilities::addURLparameter($as_url, $res);
+		return \SimpleSAML\Utils\HTTP::addURLParameters($as_url, $res);
 	}
 
 	/**
diff --git a/modules/authtwitter/lib/Auth/Source/Twitter.php b/modules/authtwitter/lib/Auth/Source/Twitter.php
index c07106633f4196b3a08a864a00c5792f77605f65..58e7ba64ae36a5d7c06e374df09cdd24e0d3b2d7 100644
--- a/modules/authtwitter/lib/Auth/Source/Twitter.php
+++ b/modules/authtwitter/lib/Auth/Source/Twitter.php
@@ -72,7 +72,7 @@ class sspmod_authtwitter_Auth_Source_Twitter extends SimpleSAML_Auth_Source {
 		// Authorize the request token
 		$url = 'https://api.twitter.com/oauth/authenticate';
 		if ($this->force_login) {
-			$url = SimpleSAML_Utilities::addURLparameter($url, array('force_login' => 'true'));
+			$url = \SimpleSAML\Utils\HTTP::addURLParameters($url, array('force_login' => 'true'));
 		}
 		$consumer->getAuthorizeRequest($url, $requestToken);
 	}
diff --git a/modules/cas/lib/Auth/Source/CAS.php b/modules/cas/lib/Auth/Source/CAS.php
index 611fd85c2defe73abb22f6a69afdb6bf856e442a..81ae59e28be8aa816c802de69c31009b676d0e02 100644
--- a/modules/cas/lib/Auth/Source/CAS.php
+++ b/modules/cas/lib/Auth/Source/CAS.php
@@ -89,7 +89,7 @@ class sspmod_cas_Auth_Source_CAS  extends SimpleSAML_Auth_Source  {
 	 * @return list username and attributes
 	 */
 	private function casValidate($ticket, $service){
-		$url = SimpleSAML_Utilities::addURLparameter($this->_casConfig['validate'], array(
+		$url = \SimpleSAML\Utils\HTTP::addURLParameters($this->_casConfig['validate'], array(
 				'ticket' => $ticket,
 				'service' => $service,
 		));
@@ -112,7 +112,7 @@ class sspmod_cas_Auth_Source_CAS  extends SimpleSAML_Auth_Source  {
 	 * @return list username and attributes
 	 */
 	private function casServiceValidate($ticket, $service){
-		$url = SimpleSAML_Utilities::addURLparameter($this->_casConfig['serviceValidate'], array(
+		$url = \SimpleSAML\Utils\HTTP::addURLParameters($this->_casConfig['serviceValidate'], array(
 				'ticket' => $ticket,
 				'service' => $service,
 		));
diff --git a/modules/casserver/www/login.php b/modules/casserver/www/login.php
index 43e08fb35b15a899f09015dfbba0c89e45ce9e64..f660a98c9e539359d46a8f71c5bbbc5d4ac053d2 100644
--- a/modules/casserver/www/login.php
+++ b/modules/casserver/www/login.php
@@ -49,7 +49,7 @@ storeTicket($ticket, $path, array('service' => $service,
 	'validbefore' => time() + 5));
 
 SimpleSAML_Utilities::redirectTrustedURL(
-	SimpleSAML_Utilities::addURLparameter($service,
+    \SimpleSAML\Utils\HTTP::addURLParameters($service,
 		array('ticket' => $ticket)
 	)
 );
\ No newline at end of file
diff --git a/modules/cdc/lib/Server.php b/modules/cdc/lib/Server.php
index 2aa88506137d7090166c9e2376049a8b79deeb14..8c2798fd71031a6809b1868cedae1ce2e138f598 100644
--- a/modules/cdc/lib/Server.php
+++ b/modules/cdc/lib/Server.php
@@ -324,7 +324,7 @@ class sspmod_cdc_Server {
 			'Signature' => $signature,
 		);
 
-		$url = SimpleSAML_Utilities::addURLparameter($to, $params);
+		$url = \SimpleSAML\Utils\HTTP::addURLParameters($to, $params);
 		if (strlen($url) < 2048) {
 			SimpleSAML_Utilities::redirectTrustedURL($url);
 		} else {
diff --git a/modules/discojuice/www/central.php b/modules/discojuice/www/central.php
index 6f1a7ead6fd137123deefb72e0e98b77073141af..9404fd546c4101224bc2ab27c68f0a0687e1650f 100644
--- a/modules/discojuice/www/central.php
+++ b/modules/discojuice/www/central.php
@@ -12,7 +12,7 @@ $entityid = $_REQUEST['entityID'];
 
 // Return to...
 $returnidparam = !empty($_REQUEST['returnIDParam']) ? $_REQUEST['returnIDParam'] : 'entityID';
-$href = SimpleSAML_Utilities::addURLparameter(
+$href = \SimpleSAML\Utils\HTTP::addURLParameters(
 	$_REQUEST['return'],
 	array($returnidparam => '')
 );
diff --git a/modules/oauth/lib/Consumer.php b/modules/oauth/lib/Consumer.php
index 8e3e5aed60fb4da5facb4b81e4c5e10c73abcb01..265b1cab906ea5dfc7ce712dacdfc163ec651e47 100644
--- a/modules/oauth/lib/Consumer.php
+++ b/modules/oauth/lib/Consumer.php
@@ -91,7 +91,7 @@ class sspmod_oauth_Consumer {
 		if ($callback) {
 			$params['oauth_callback'] = $callback;
 		}
-		$authorizeURL = SimpleSAML_Utilities::addURLparameter($url, $params);
+		$authorizeURL = \SimpleSAML\Utils\HTTP::addURLParameters($url, $params);
 		if ($redirect) {
 			SimpleSAML_Utilities::redirectTrustedURL($authorizeURL);
 			exit;
diff --git a/modules/oauth/lib/OAuthStore.php b/modules/oauth/lib/OAuthStore.php
index 6a239a6c04e51d5d5cc76161356893b1d3e55fdf..974387a21a410a147f72ab4c3022a6dbbade49e0 100644
--- a/modules/oauth/lib/OAuthStore.php
+++ b/modules/oauth/lib/OAuthStore.php
@@ -63,7 +63,7 @@ class sspmod_oauth_OAuthStore extends OAuthDataStore {
 		if ($oConsumer && ($oConsumer->callback_url)) $url = $oConsumer->callback_url;
 		
 		$verifier = SimpleSAML\Utils\Random::generateID();
-		$url = SimpleSAML_Utilities::addURLparameter($url, array("oauth_verifier"=>$verifier));
+		$url = \SimpleSAML\Utils\HTTP::addURLParameters($url, array("oauth_verifier"=>$verifier));
 		
 		$this->store->set('authorized', $requestTokenKey, $verifier, $data, $this->config->getValue('requestTokenDuration', 60*30) );
 		
diff --git a/modules/oauth/www/authorize.php b/modules/oauth/www/authorize.php
index afcc395b9a1722fb6d65795967307f7b1e4b459e..523670ecf148be54873fa8d3797638c1fee1e60a 100644
--- a/modules/oauth/www/authorize.php
+++ b/modules/oauth/www/authorize.php
@@ -40,7 +40,7 @@ try {
 		$t = new SimpleSAML_XHTML_Template($config, 'oauth:consent.php');
 		$t->data['header'] = '{status:header_saml20_sp}';
 		$t->data['consumer'] = $consumer;	// array containint {name, description, key, secret, owner} keys
-		$t->data['urlAgree'] = SimpleSAML_Utilities::addURLparameter( SimpleSAML_Utilities::selfURL(), array("consent" => "yes") );
+		$t->data['urlAgree'] = \SimpleSAML\Utils\HTTP::addURLParameters(SimpleSAML_Utilities::selfURL(), array("consent" => "yes"));
 		$t->data['logouturl'] = SimpleSAML_Utilities::selfURLNoQuery() . '?logout';
 	
 		$t->show();
diff --git a/modules/saml/lib/IdP/SAML1.php b/modules/saml/lib/IdP/SAML1.php
index 9ef95b78a5f679eefeced77140d7b3b91231d2c3..79c8617ea2f7347c1ebf6d6efa2f0ef1a4889919 100644
--- a/modules/saml/lib/IdP/SAML1.php
+++ b/modules/saml/lib/IdP/SAML1.php
@@ -115,7 +115,7 @@ class sspmod_saml_IdP_SAML1 {
 			'protocol' => 'saml1',
 		));
 
-		$sessionLostURL = SimpleSAML_Utilities::addURLparameter(
+		$sessionLostURL = \SimpleSAML\Utils\HTTP::addURLParameters(
 			SimpleSAML_Utilities::selfURL(),
 			array('cookieTime' => time()));
 
diff --git a/modules/saml/lib/IdP/SAML2.php b/modules/saml/lib/IdP/SAML2.php
index ae9a6d4fbd5f7dedc81eee0261631cf10f9fdc6c..a6bf33a4c8e793af3315346c3907fea00ca17746 100644
--- a/modules/saml/lib/IdP/SAML2.php
+++ b/modules/saml/lib/IdP/SAML2.php
@@ -361,7 +361,7 @@ class sspmod_saml_IdP_SAML2 {
 			$sessionLostParams['RelayState'] = $relayState;
 		}
 
-		$sessionLostURL = SimpleSAML_Utilities::addURLparameter(
+		$sessionLostURL = \SimpleSAML\Utils\HTTP::addURLParameters(
 			SimpleSAML_Utilities::selfURLNoQuery(),
 			$sessionLostParams);
 
diff --git a/templates/includes/header.php b/templates/includes/header.php
index cb59059fc896289154c728c192028021a6ed9e10..10f75765b7a61148edb2092aceb3316071078d17 100644
--- a/templates/includes/header.php
+++ b/templates/includes/header.php
@@ -186,7 +186,7 @@ if($onLoad !== '') {
 				if ($current) {
 					$textarray[] = $langnames[$lang];
 				} else {
-					$textarray[] = '<a href="' . htmlspecialchars(SimpleSAML_Utilities::addURLparameter(SimpleSAML_Utilities::selfURL(), array($this->languageParameterName => $lang))) . '">' .
+					$textarray[] = '<a href="' . htmlspecialchars(\SimpleSAML\Utils\HTTP::addURLParameters(SimpleSAML_Utilities::selfURL(), array($this->languageParameterName => $lang))) . '">' .
 						$langnames[$lang] . '</a>';
 				}
 			}
diff --git a/www/shib13/idp/metadata.php b/www/shib13/idp/metadata.php
index fc0a3583431b4b4376f8523539f22ba03cdf5143..92eb4ec05119d3036757f9f1c66ccf46165ee492 100644
--- a/www/shib13/idp/metadata.php
+++ b/www/shib13/idp/metadata.php
@@ -87,7 +87,7 @@ try {
 	
 		$t->data['header'] = 'shib13-idp';
 		
-		$t->data['metaurl'] = SimpleSAML_Utilities::addURLparameter(SimpleSAML_Utilities::selfURLNoQuery(), array('output' => 'xml'));
+		$t->data['metaurl'] = \SimpleSAML\Utils\HTTP::addURLParameters(SimpleSAML_Utilities::selfURLNoQuery(), array('output' => 'xml'));
 		$t->data['metadata'] = htmlspecialchars($metaxml);
 		$t->data['metadataflat'] = htmlspecialchars($metaflat);