diff --git a/src/modules/outbound/outbound_mod.c b/src/modules/outbound/outbound_mod.c
index a797eb8132e..32f10f6cdb9 100644
--- a/src/modules/outbound/outbound_mod.c
+++ b/src/modules/outbound/outbound_mod.c
@@ -75,7 +75,7 @@ struct module_exports exports = {
 		destroy						 /* destroy function */
 };
 
-static void *mod_init_openssl(void *) {
+static void *mod_init_openssl(void *arg) {
     if(flow_token_secret.s) {
         assert(ob_key.len == SHA_DIGEST_LENGTH);
         LM_DBG("flow_token_secret mod param set. use persistent ob_key");