diff --git a/game/scripts/utility/common_functions.rpy b/game/scripts/utility/common_functions.rpy
index 20eefb75..b6f8d03a 100644
--- a/game/scripts/utility/common_functions.rpy
+++ b/game/scripts/utility/common_functions.rpy
@@ -186,9 +186,9 @@ init python early:
         return s1.replace(filter, "") == s2.replace(filter, "")
 
     def istype(inst, clss):
-        if not isinstance(clss, (list, tuple, set)):
-            clss = (clss,)
-        return type(inst) in clss
+        if isinstance(clss, (list, tuple, set)):
+            return type(inst) in clss
+        return type(inst) is clss
 
     class IntLike(python_object):
         # Does not support rollback