diff --git a/silicon/__init__.py b/silicon/__init__.py
index 4029d07..a069539 100644
--- a/silicon/__init__.py
+++ b/silicon/__init__.py
@@ -6,10 +6,6 @@
 from flask import Flask
 
 
-class AppConfigurationError(Exception):
-    pass
-
-
 def create_app(test_config=None):
     """
     Create the application object, sprinkle in some configuration,