diff --git a/lib/SimpleSAML/Utils/Crypto.php b/lib/SimpleSAML/Utils/Crypto.php
index b9bca595c067bf724b33fb634439badf2b3abc25..7da5bd294a5bd85b2b70ff1f45c28f769a628ef0 100644
--- a/lib/SimpleSAML/Utils/Crypto.php
+++ b/lib/SimpleSAML/Utils/Crypto.php
@@ -57,7 +57,7 @@ class Crypto
                 $iv
             );
 
-            if ($plaintext != false) {
+            if ($plaintext !== false) {
                 return $plaintext;
             }
         }