diff --git a/lib/Saml2/Response.php b/lib/Saml2/Response.php
index 3402dc98..2f523d13 100644
--- a/lib/Saml2/Response.php
+++ b/lib/Saml2/Response.php
@@ -1001,7 +1001,7 @@ protected function _decryptAssertion($dom)
 
                 if (strpos($encryptedAssertion->tagName, 'saml2:') !== false) {
                     $ns = 'xmlns:saml2';
-                } else if (strpos($encryptedAssertion->tagName, 'saml:') != false) {
+                } else if (strpos($encryptedAssertion->tagName, 'saml:') !== false) {
                     $ns = 'xmlns:saml';
                 } else {
                     $ns = 'xmlns';