diff --git a/host/ledbar.c b/host/ledbar.c
index 4b2df21..d188fed 100644
--- a/host/ledbar.c
+++ b/host/ledbar.c
@@ -261,6 +261,7 @@ void drawScreen(SDL_Surface* screen, int t, FILE* fp)
 
     if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
     SDL_Flip(screen);
+    fflush(fp);
 }