diff --git a/test/hash_index.c b/test/hash_index.c
index 22eaa4e26..6e99724bd 100644
--- a/test/hash_index.c
+++ b/test/hash_index.c
@@ -298,9 +298,7 @@ static void test_invalid_size(Fixture *fixture, gconstpointer user_data)
 	// open and calculate hash index
 	index = r_hash_index_open("test", datafd, NULL, &error);
 	g_assert_error(error, R_HASH_INDEX_ERROR, R_HASH_INDEX_ERROR_SIZE);
-	g_assert_nonnull(index);
-	datafd = -1; /* belongs to index now */
-	(void)datafd; /* ignore dead store */
+	g_assert_null(index);
 }
 
 int main(int argc, char *argv[])