diff --git a/source/games/sw/src/game.cpp b/source/games/sw/src/game.cpp
index a13784d4a..10246541a 100644
--- a/source/games/sw/src/game.cpp
+++ b/source/games/sw/src/game.cpp
@@ -106,6 +106,7 @@ IMPLEMENT_POINTER(user.WpnGoalActor)
 IMPLEMENT_POINTERS_END
 
 void MarkSOInterp();
+extern int FinishTimer;
 
 void markgcroots()
 {