diff --git a/res/res_pjsip_registrar.c b/res/res_pjsip_registrar.c
index 62b738a845..953be2070e 100644
--- a/res/res_pjsip_registrar.c
+++ b/res/res_pjsip_registrar.c
@@ -975,7 +975,7 @@ static char *find_aor_name(const char *username, const char *domain, const char
 	if (alias) {
 		char *id_domain_alias = ast_alloca(strlen(username) + strlen(alias->domain) + 2);
 
-		sprintf(id_domain, "%s@%s", username, alias->domain);
+		sprintf(id_domain_alias, "%s@%s", username, alias->domain);
 		ao2_cleanup(alias);
 
 		configured_aors = strcpy(aors_buf, aors);/* Safe */