1 files changed, 1 insertions, 0 deletions
diff --git a/src/game.h b/src/game.h
index 1b9373a9..628c710b 100644
--- a/src/game.h
+++ b/src/game.h
@@ -29,6 +29,7 @@
 extern std::string map_path;
 extern volatile int fps;
 extern volatile int tick_time;
+extern const int MILLISECONDS_IN_A_TICK;
 
 class WindowMenu;