diff --git a/lib/SimpleSAML/Metadata/SAMLParser.php b/lib/SimpleSAML/Metadata/SAMLParser.php
index 4ed78b0514775bae4856562f3bcdf64f380e5c55..3f9eb3bcab3ddf2491cbad9d29c545e5f9dc2407 100644
--- a/lib/SimpleSAML/Metadata/SAMLParser.php
+++ b/lib/SimpleSAML/Metadata/SAMLParser.php
@@ -1044,7 +1044,7 @@ class SAMLParser
                             $attrNameFormat = $attr->getNameFormat();
                             $attrValue = $attr->getAttributeValue();
 
-                            if ($attrName() === null || $attrValue === []) {
+                            if ($attrName === null || $attrValue === []) {
                                 continue;
                             }