diff --git a/modules/sanity/sanity.c b/modules/sanity/sanity.c
index 8140c07b293..581219001b4 100644
--- a/modules/sanity/sanity.c
+++ b/modules/sanity/sanity.c
@@ -724,6 +724,7 @@ int check_proxy_require(struct sip_msg* _msg) {
 			 * freed when the message freed. Lets hope nobody needs to access
 			 * this header again later on */
 			free_str_list(_msg->proxy_require->parsed);
+			_msg->proxy_require->parsed = NULL;
 		}
 	}
 #ifdef EXTRA_DEBUG