diff --git a/client/ayon_core/lib/path_templates.py b/client/ayon_core/lib/path_templates.py
index 2f5282c2fa..e04fb95d70 100644
--- a/client/ayon_core/lib/path_templates.py
+++ b/client/ayon_core/lib/path_templates.py
@@ -455,7 +455,7 @@ class FormattingPart:
             return True
 
         for inh_class in type(value).mro():
-            if inh_class in str:
+            if isinstance(inh_class, str):
                 return True
         return False