diff --git a/src/video.c b/src/video.c
index 490a349..a515919 100644
--- a/src/video.c
+++ b/src/video.c
@@ -522,6 +522,8 @@ void video_wait_for_buffer()
 
 void video_blit_memtoscreen(int x, int y, int y1, int y2, int w, int h)
 {
+        if (h <= 0)
+                return;
         video_wait_for_blit();
         blit_data.busy = 1;
         blit_data.buffer_in_use = 1;