diff --git a/lib/SimpleSAML/Metadata/SAMLParser.php b/lib/SimpleSAML/Metadata/SAMLParser.php
index 5545dc91234d69d4c6c7c2f4a1bf44df8d5287dd..d252af5bd507a4b93cd4a28cb882ea259d6a1995 100644
--- a/lib/SimpleSAML/Metadata/SAMLParser.php
+++ b/lib/SimpleSAML/Metadata/SAMLParser.php
@@ -682,7 +682,7 @@ class SimpleSAML_Metadata_SAMLParser {
 
 		/* Enable redirect.sign if WantAuthnRequestsSigned is enabled. */
 		if ($idp['WantAuthnRequestsSigned']) {
-			$ret['redirect.sign'] = TRUE;
+			$ret['sign.authnrequest'] = TRUE;
 		}
 
 		/* Find the SSO service endpoint. */