diff --git a/bl31/runtime_svc.c b/bl31/runtime_svc.c
index 08cd2d8..c33748f 100644
--- a/bl31/runtime_svc.c
+++ b/bl31/runtime_svc.c
@@ -78,7 +78,7 @@
  * The unique oen is used as an index into the 'rt_svc_descs_indices' array.
  * The index of the runtime service descriptor is stored at this index.
  ******************************************************************************/
-void runtime_svc_init()
+void runtime_svc_init(void)
 {
 	int32_t rc = 0;
 	uint32_t index, start_idx, end_idx;