diff --git a/tests/dec/test_known_decay_models.py b/tests/dec/test_known_decay_models.py
index f95f63ef..15a42027 100644
--- a/tests/dec/test_known_decay_models.py
+++ b/tests/dec/test_known_decay_models.py
@@ -309,7 +309,7 @@ def test_lark_file_model_list_consistency():
 
 def test_parsing_of_all_known_models_are_tested():
     assert (
-        len(parsed_models) == len(known_decay_models) - 52
+        len(parsed_models) == len(known_decay_models) - 51
     )  # subtract for now the number of models not yet tested