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-rw-r--r--src/heretic/p_tick.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/heretic/p_tick.c b/src/heretic/p_tick.c
index 8a2b2577..089afdbf 100644
--- a/src/heretic/p_tick.c
+++ b/src/heretic/p_tick.c
@@ -24,6 +24,7 @@
// P_tick.c
#include "doomdef.h"
+#include "i_system.h"
#include "p_local.h"
#include "v_video.h"