diff --git a/http.c b/http.c
index 576740feff..ae27e0c940 100644
--- a/http.c
+++ b/http.c
@@ -300,6 +300,7 @@ void http_cleanup(void)
 	curl_global_cleanup();
 
 	curl_slist_free_all(pragma_header);
+        pragma_header = NULL;
 }
 
 struct active_request_slot *get_active_slot(void)