diff --git a/bl31/context_mgmt.c b/bl31/context_mgmt.c
index 81c7c56..65f1213 100644
--- a/bl31/context_mgmt.c
+++ b/bl31/context_mgmt.c
@@ -56,7 +56,7 @@
  * which will used for programming an entry into a lower EL. The same context
  * will used to save state upon exception entry from that EL.
  ******************************************************************************/
-void cm_init()
+void cm_init(void)
 {
 	/*
 	 * The context management library has only global data to intialize, but