diff --git a/src/processing/__init__.py b/src/processing/__init__.py
index 744b7dd95256272ccc0e3860a7cfc72fbd9db3b7..840cd35a545e3305e451a949a1e0a02eb9fbda55 100644
--- a/src/processing/__init__.py
+++ b/src/processing/__init__.py
@@ -104,7 +104,7 @@ def skyline(scene):
 
 
 def mztest():
-  return a
+  return 1
 
 
 def michelson_contrast(scene, size=3):