diff --git a/sc2/src/sc2code/process.c b/sc2/src/sc2code/process.c
index 728369ac5..82ccc92f8 100644
--- a/sc2/src/sc2code/process.c
+++ b/sc2/src/sc2code/process.c
@@ -1004,7 +1004,7 @@ InitDisplayList (void)
 	DisplayLinks = MakeLinks (END_OF_LIST, END_OF_LIST);
 }
 
-UWORD nth_frame;
+UWORD nth_frame = 0;
 
 void
 RedrawQueue (BOOLEAN clear)