diff --git a/jail2ban/__init__.py b/jail2ban/__init__.py
index 9d43d7f..a4b14e9 100644
--- a/jail2ban/__init__.py
+++ b/jail2ban/__init__.py
@@ -26,15 +26,11 @@ def untaint(pattern, string):
         raise ValueError(f'"{string}" is tainted')
 
 
-def create_app(config=None):
+def create_app():
     app = Flask(__name__, instance_relative_config=True)
 
-    if config is None:
-        # load the instance config, if it exists, when not testing
-        app.config.from_pyfile('config.py', silent=True)
-    else:
-        # load the test config if passed in
-        app.config.from_pyfile(config, silent=True)
+    # load the instance config, if it exists, when not testing
+    app.config.from_pyfile('config.py', silent=True)
 
     @auth.verify_password
     def verify_password(username, password):