diff --git a/domains/m.yac.is-local.org.json b/domains/m-yac.is-local.org.json
similarity index 93%
rename from domains/m.yac.is-local.org.json
rename to domains/m-yac.is-local.org.json
index ac2a9bed..947f3c44 100644
--- a/domains/m.yac.is-local.org.json
+++ b/domains/m-yac.is-local.org.json
@@ -1,7 +1,7 @@
 {
     "description": "YAC Email",
     "domain": "is-local.org",
-    "subdomain": "m.yac",
+    "subdomain": "m-yac",
 
     "owner": {
         "repo": "https://github.com/lverx/lverx.github.io",