diff --git a/smoke-test/tests/dataproduct/test_dataproduct.py b/smoke-test/tests/dataproduct/test_dataproduct.py
index 0d0141e9111c0..88a1c42ddca03 100644
--- a/smoke-test/tests/dataproduct/test_dataproduct.py
+++ b/smoke-test/tests/dataproduct/test_dataproduct.py
@@ -87,7 +87,7 @@ def create_test_data(filename: str):
 
 @pytest.fixture(scope="module", autouse=False)
 def ingest_cleanup_data(request):
-    new_file, filename = tempfile.mkstemp()
+    new_file, filename = tempfile.mkstemp(suffix=".json")
     try:
         create_test_data(filename)
         print("ingesting data products test data")