diff --git a/src/modules/evas/engines/software_x11/evas_xcb_outbuf.c b/src/modules/evas/engines/software_x11/evas_xcb_outbuf.c
index 85f48e92ed..e746ddc97a 100644
--- a/src/modules/evas/engines/software_x11/evas_xcb_outbuf.c
+++ b/src/modules/evas/engines/software_x11/evas_xcb_outbuf.c
@@ -1125,7 +1125,7 @@ _find_xcbob(xcb_connection_t *conn, xcb_visualtype_t *vis, int depth, int w, int
         lbytes = ((((w * bpp) + 3) / 4) * 4);
      }
    else
-     lbytes = (((w + 63) / 64) * 4);
+     lbytes = (((w + 63) / 64) * 8);
 
    sz = (lbytes * h);
    SHMPOOL_LOCK();