diff --git a/sc2/src/libs/input/sdl/vcontrol.c b/sc2/src/libs/input/sdl/vcontrol.c
index 8dbe67306..9d9a29af0 100644
--- a/sc2/src/libs/input/sdl/vcontrol.c
+++ b/sc2/src/libs/input/sdl/vcontrol.c
@@ -1265,7 +1265,7 @@ VControl_ParseGesture (VCONTROL_GESTURE *g, const char *spec)
 	parse_state ps;
 
 	strncpy (ps.line, spec, LINE_SIZE);
-	ps.line[LINE_SIZE] = '\0';
+	ps.line[LINE_SIZE - 1] = '\0';
 	ps.index = ps.error = 0;
 	ps.linenum = -1;