diff --git a/src/Meshcore.php b/src/Meshcore.php
index 458c918..5579fc5 100644
--- a/src/Meshcore.php
+++ b/src/Meshcore.php
@@ -352,13 +352,13 @@ class Meshcore {
             $obj = CoreParser::parseResponse($response);
 
             echo "D: got a " . get_class($obj) . ", was expecting $class_expected\n";
-            
-            if( !is_a($obj, $class_expected) ) {
+
+            if( get_class($obj) != $class_expected ) {
                 array_push($this->msg_queue, $obj);
             }
         }
-        while((time() - $mark) < 5 || is_a($obj, $class_expected));
+        while((time() - $mark) < 5 && get_class($obj) != $class_expected);
 
-        return (is_a($obj, $class_expected))?$obj:null;
+        return (get_class($obj) == $class_expected)?$obj:null;
     }
 }
\ No newline at end of file