diff --git a/programs/clock/winclock.c b/programs/clock/winclock.c
index 34d18ddac22..0b2def11ab6 100644
--- a/programs/clock/winclock.c
+++ b/programs/clock/winclock.c
@@ -46,7 +46,7 @@ typedef struct
     POINT End;
 } HandData;
 
-HandData HourHand, MinuteHand, SecondHand;
+static HandData HourHand, MinuteHand, SecondHand;
 
 static void DrawTicks(HDC dc, const POINT* centre, int radius)
 {