diff --git a/win/X11/pet_mark.xbm b/win/X11/pet_mark.xbm
new file mode 100644
index 000000000..69b4cf004
--- /dev/null
+++ b/win/X11/pet_mark.xbm
@@ -0,0 +1,6 @@
+#define pet_mark_width 16
+#define pet_mark_height 16
+static unsigned char pet_mark_bits[] = {
+   0x00, 0x00, 0x6c, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0x7c, 0x00, 0x38, 0x00,
+   0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};