diff --git a/src/saml2/mdstore.py b/src/saml2/mdstore.py
index 2ea9742f0..9dd0019c6 100644
--- a/src/saml2/mdstore.py
+++ b/src/saml2/mdstore.py
@@ -1114,7 +1114,7 @@ def reload(self, spec):
 
     def imp(self, spec):
         # This serves as a backwards compatibility
-        if type(spec) is dict:
+        if isinstance(spec, dict):
             # Old style...
             for key, vals in spec.items():
                 for val in vals: