diff --git a/python_modules/dagster/dagster_tests/definitions_tests/test_observable_assets.py b/python_modules/dagster/dagster_tests/definitions_tests/test_observable_assets.py
index 369b3993dfa92..027ef0b43f02d 100644
--- a/python_modules/dagster/dagster_tests/definitions_tests/test_observable_assets.py
+++ b/python_modules/dagster/dagster_tests/definitions_tests/test_observable_assets.py
@@ -1,4 +1,4 @@
-from typing import AbstractSet
+from typing import AbstractSet, Iterable
 
 import pytest
 from dagster import (
@@ -128,12 +128,12 @@ def an_asset(source_asset: str) -> str:
 
 
 def get_job_for_assets(defs: Definitions, *coercibles_or_defs) -> JobDefinition:
-    job_def = defs.get_implicit_job_def_for_assets(set_from_coercibles_or_defs(*coercibles_or_defs))
+    job_def = defs.get_implicit_job_def_for_assets(set_from_coercibles_or_defs(coercibles_or_defs))
     assert job_def, "Expected to find a job def"
     return job_def
 
 
-def set_from_coercibles_or_defs(*coercibles_or_defs) -> AbstractSet["AssetKey"]:
+def set_from_coercibles_or_defs(coercibles_or_defs: Iterable) -> AbstractSet["AssetKey"]:
     return set(
         [
             AssetKey.from_coercible_or_definition(coercible_or_def)