diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 3ff7d3356..5ad5d4269 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -294,7 +294,7 @@ def get_dependant(
         if param_name in path_param_names:
             assert is_scalar_field(
                 field=param_field
-            ), f"Path params must be of one of the supported types"
+            ), "Path params must be of one of the supported types"
             if isinstance(param.default, params.Path):
                 ignore_default = False
             else:
diff --git a/fastapi/routing.py b/fastapi/routing.py
index dab751a09..71a2b4d04 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -365,7 +365,7 @@ class APIRoute(routing.Route):
         self.include_in_schema = include_in_schema
         self.response_class = response_class
 
-        assert callable(endpoint), f"An endpoint must be a callable"
+        assert callable(endpoint), "An endpoint must be a callable"
         self.dependant = get_dependant(path=self.path_format, call=self.endpoint)
         for depends in self.dependencies[::-1]:
             self.dependant.dependencies.insert(