diff --git a/libvo/vo_x11.c b/libvo/vo_x11.c
index c132f0cce2..32ef9609ce 100644
--- a/libvo/vo_x11.c
+++ b/libvo/vo_x11.c
@@ -250,6 +250,7 @@ static uint32_t config( uint32_t width,uint32_t height,uint32_t d_width,uint32_t
     title = strdup("MPlayer X11 (XImage/Shm) render");
 
  in_format=format;
+ if(in_format==IMGFMT_I420 || in_format==IMGFMT_IYUV) in_format=IMGFMT_YV12;
  srcW= width;
  srcH= height;