diff --git a/services/spd/trusty/trusty.c b/services/spd/trusty/trusty.c
index 7e8526d..4c688ca 100644
--- a/services/spd/trusty/trusty.c
+++ b/services/spd/trusty/trusty.c
@@ -229,7 +229,7 @@
 
 static int32_t trusty_init(void)
 {
-	void el3_exit();
+	void el3_exit(void);
 	entry_point_info_t *ep_info;
 	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
 	uint32_t cpu = plat_my_core_pos();