diff --git a/src/p_tick.c b/src/p_tick.c
index 70b0d05a6..75e5a6bef 100644
--- a/src/p_tick.c
+++ b/src/p_tick.c
@@ -25,6 +25,7 @@
 #include "k_kart.h"
 #include "k_battle.h"
 #include "k_waypoint.h"
+#include "i_system.h"
 
 // Object place
 #include "m_cheat.h"