1 files changed, 1 insertions, 1 deletions
diff --git a/src/saml2/mdstore.py b/src/saml2/mdstore.py
index 639c7a2d..b2bae0a7 100644
--- a/src/saml2/mdstore.py
+++ b/src/saml2/mdstore.py
@@ -131,7 +131,7 @@ def load_extensions():
     from saml2 import extension
 
     package = extension
-    prefix = package.__name__ + "."
+    prefix = f"{package.__name__}."
     ext_map = {}
     for importer, modname, ispkg in pkgutil.iter_modules(package.__path__, prefix):
         module = __import__(modname, fromlist="dummy")