diff --git a/coreapi/sal_eXosip2.c b/coreapi/sal_eXosip2.c
index 821e4ab39..b09cae4ff 100644
--- a/coreapi/sal_eXosip2.c
+++ b/coreapi/sal_eXosip2.c
@@ -2261,21 +2261,23 @@ int sal_register(SalOp *h, const char *proxy, const char *from, int expires){
 int sal_register_refresh(SalOp *op, int expires){
 	osip_message_t *msg=NULL;
 	const char *contact=sal_op_get_contact(op);
-	int tries=0;
 	
 	if (op->rid==-1){
 		ms_error("Unexistant registration context, not possible to refresh.");
 		return -1;
 	}
 #ifdef HAVE_EXOSIP_TRYLOCK
-	/*iOS hack: in the keep alive handler, we have no more than 10 seconds to refresh registers, otherwise the application is suspended forever.
-	 * In order to prevent this case that can occur when the exosip thread is busy with DNS while network isn't in a good shape, we try to take
-	 * the exosip lock in a non blocking way, and give up if it takes too long*/
-	while (eXosip_trylock()!=0){
-		ms_usleep(100000);
-		if (tries>30) {/*after 3 seconds, give up*/
-			ms_warning("Could not obtain exosip lock in a reasonable time, giving up.");
-			return -1;
+	{
+		int tries=0;
+		/*iOS hack: in the keep alive handler, we have no more than 10 seconds to refresh registers, otherwise the application is suspended forever.
+		* In order to prevent this case that can occur when the exosip thread is busy with DNS while network isn't in a good shape, we try to take
+		* the exosip lock in a non blocking way, and give up if it takes too long*/
+		while (eXosip_trylock()!=0){
+			ms_usleep(100000);
+			if (tries>30) {/*after 3 seconds, give up*/
+				ms_warning("Could not obtain exosip lock in a reasonable time, giving up.");
+				return -1;
+			}
 		}
 	}
 #else