diff --git a/cscape.c b/cscape.c
index 9dabbc2..2ca267b 100644
--- a/cscape.c
+++ b/cscape.c
@@ -113,7 +113,7 @@ void fly(SDL_Surface *screen) {
         if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
 	SDL_UpdateRect(screen, 0, 0, WIDTH, HEIGHT);
 
-	usleep(1000/25);
+	usleep(1000*1000/25);
 }
 
 int main(void) {