diff --git a/tests/feeds_fetcher_http.test b/tests/feeds_fetcher_http.test
index 1a7a6ab..32618ad 100644
--- a/tests/feeds_fetcher_http.test
+++ b/tests/feeds_fetcher_http.test
@@ -249,6 +249,7 @@ class FeedsFileHTTPTestCase extends FeedsWebTestCase {
     file_put_contents($file_url_no_cache_record, static::randomString());
 
     // Trigger cleanup of orphaned cached files.
+    variable_del('feeds_sync_cache_feeds_http_last_check');
     $this->cronRun();
 
     // Assert that the dummy cached file has been cleaned up and the other file