diff --git a/Nasal/globals.nas b/Nasal/globals.nas
index b8b5fe50d..9217e47e6 100644
--- a/Nasal/globals.nas
+++ b/Nasal/globals.nas
@@ -28,7 +28,7 @@ var __ = {};
 #
 var isa = func(obj, class) {
     if(typeof(obj) == "hash" and obj["parents"] != nil)
-        foreach(c; obj.parents)
+        foreach(var c; obj.parents)
             if(c == class or isa(c, class))
                 return 1;
     return 0;