diff --git a/python/mpact/mpactbackend.py b/python/mpact/mpactbackend.py
index 80b58df..052be51 100644
--- a/python/mpact/mpactbackend.py
+++ b/python/mpact/mpactbackend.py
@@ -17,6 +17,7 @@
     LinalgOnTensorsBackend,
 )
 
+a = [  ]
 
 def assert_arg_type_is_supported(ty):
     SUPPORTED = [