diff --git a/data/phone_formats.json b/data/phone_formats.json
index f90fe80b5..10b8d830f 100644
--- a/data/phone_formats.json
+++ b/data/phone_formats.json
@@ -38,6 +38,7 @@
   "ky": "+1-345-555-1234",
   "kz": "+7 495 1234567",
   "lc": "+1-758-555-1234",
+  "mo": "+853 1234 5678",
   "mp": "+1-670-555-1234",
   "ms": "+1-664-555-1234",
   "nl": "+31 42 123 4567",