diff --git a/stone/backends/python_rsrc/stone_validators.py b/stone/backends/python_rsrc/stone_validators.py
index dc553ee8..c124aebb 100644
--- a/stone/backends/python_rsrc/stone_validators.py
+++ b/stone/backends/python_rsrc/stone_validators.py
@@ -711,7 +711,7 @@ def apply(self, val):
         try:
             # add string literal to ensure unicode
             hashed = hashlib.md5(val_to_hash.encode('utf-8')).hexdigest() + ''
-        except [AttributeError, ValueError]:
+        except (AttributeError, ValueError):
             hashed = None
 
         if matches: