diff --git a/tests/serialization_tests.py b/tests/serialization_tests.py
index 537e642c..a49ae7e6 100644
--- a/tests/serialization_tests.py
+++ b/tests/serialization_tests.py
@@ -736,7 +736,7 @@ def my_callable():
         self.assertIs(finder['qctoolkit.asd'], my_callable)
 
         finder.qctoolkit_alias = False
-        with self.assertRaises(KeyError):
+        with self.assertRaises(ModuleNotFoundError):
             finder['qctoolkit.asd']