diff --git a/src/p_tick.c b/src/p_tick.c
index f2aab3aef..7cf1748b5 100644
--- a/src/p_tick.c
+++ b/src/p_tick.c
@@ -24,6 +24,7 @@
 #include "lua_hook.h"
 #include "m_perfstats.h"
 #include "i_system.h" // I_GetPreciseTime
+#include "i_video.h" // rendermode
 #include "r_main.h"
 #include "r_fps.h"