diff --git a/aws/logs_monitoring/tests/test_lambda_function.py b/aws/logs_monitoring/tests/test_lambda_function.py
index e61a6dd4..ef762a0d 100644
--- a/aws/logs_monitoring/tests/test_lambda_function.py
+++ b/aws/logs_monitoring/tests/test_lambda_function.py
@@ -34,7 +34,7 @@
     enrich,
     transform,
     split,
-    merge_custom_and_application_tags,
+    merge_tags,
 )
 from parsing import parse, parse_event_type
 
@@ -318,7 +318,7 @@ def test_merge_custom_and_application_tags(self):
         message_tags = "key0:value0,key1:value1"
         custom_tags = "key2:value2,key0:value3"
         self.assertEqual(
-            merge_custom_and_application_tags(custom_tags, message_tags),
+            merge_tags(custom_tags, message_tags),
             "key0:value0,key1:value1,key2:value2",
         )