diff --git a/mediacloud/test/api_search_test.py b/mediacloud/test/api_search_test.py
index fb59ba1..1ffb19d 100644
--- a/mediacloud/test/api_search_test.py
+++ b/mediacloud/test/api_search_test.py
@@ -14,7 +14,7 @@
 START_DATE = dt.date(2023, 11, 1)
 END_DATE = dt.date(2023, 12, 1)
 
-#Optionally override the target instance when testing, for staging/dev cases
+# Optionally override the target instance when testing, for staging/dev cases
 mediacloud.api.BaseApi.BASE_API_URL = os.getenv("MC_API_BASE_URL", "https://search.mediacloud.org/api/")
 
 
@@ -178,11 +178,13 @@ def test_story_list_sort_order(self):
 
     def test_search_by_indexed_date(self):
         # compare results with indexed_date clause to those without it
-        results1 = self._search.story_count(query="weather", start_date=START_DATE, end_date=END_DATE)
+        results1 = self._search.story_count(query="weather", start_date=START_DATE, end_date=END_DATE,
+                                            collection_ids=[COLLECTION_US_NATIONAL])
         assert results1['total'] > 0
         results2 = self._search.story_count(query="weather and indexed_date:[{} TO {}]".format(
             START_DATE.isoformat(), END_DATE.isoformat()),
-            start_date=START_DATE, end_date=END_DATE)
+            start_date=START_DATE, end_date=END_DATE,
+            collection_ids=[COLLECTION_US_NATIONAL])
         assert results2['total'] > 0
         assert results1['total'] == results2['total']
         assert results1['relevant'] != results2['relevant']