diff --git a/server/backend/database/testcases/testcases.go b/server/backend/database/testcases/testcases.go
index 9bd173d72..5ae8dbd0c 100644
--- a/server/backend/database/testcases/testcases.go
+++ b/server/backend/database/testcases/testcases.go
@@ -143,7 +143,8 @@ func RunFindDocInfosByKeysTest(
 		}
 
 		// 02. Find documents
-		infos, err := db.FindDocInfosByKeys(ctx, projectID, []key.Key{})
+		var emptyKeys []key.Key
+		infos, err := db.FindDocInfosByKeys(ctx, projectID, emptyKeys)
 		assert.NoError(t, err)
 		assert.Len(t, infos, 0)
 	})