diff --git a/daemon/gamemode-tests.c b/daemon/gamemode-tests.c
index b8549ae..beebc6a 100644
--- a/daemon/gamemode-tests.c
+++ b/daemon/gamemode-tests.c
@@ -705,7 +705,7 @@ static int run_supervisor_tests(void)
  *
  * returns 0 for success, -1 for failure
  */
-int game_mode_run_client_tests()
+int game_mode_run_client_tests(void)
 {
 	int status = 0;
 
diff --git a/daemon/gamemode.c b/daemon/gamemode.c
index cf90a26..71f1a78 100644
--- a/daemon/gamemode.c
+++ b/daemon/gamemode.c
@@ -632,7 +632,7 @@ static void *game_mode_context_reaper(void *userdata)
 	return NULL;
 }
 
-GameModeContext *game_mode_context_instance()
+GameModeContext *game_mode_context_instance(void)
 {
 	return &instance;
 }