diff --git a/tests/lib/SimpleSAML/Utils/CryptoTest.php b/tests/lib/SimpleSAML/Utils/CryptoTest.php
index 84eed30ee2041f6f32202b1ce3ba694c2982a78a..cb31cdbae0b8afa9c18f0b74c9ca4921c6ba7d5e 100644
--- a/tests/lib/SimpleSAML/Utils/CryptoTest.php
+++ b/tests/lib/SimpleSAML/Utils/CryptoTest.php
@@ -532,7 +532,8 @@ PHP;
             'test'
         );
 
-        $res = Crypto::loadPublicKey($config)['certData'];
+        $pubkey = Crypto::loadPublicKey($config);
+        $res = $pubkey['certData'];
         $expected = $x509certificate;
 
         $this->assertEquals($expected, $res);