diff --git a/config/filters/index.js b/config/filters/index.js
index f9e96dd7..9d47a7ac 100644
--- a/config/filters/index.js
+++ b/config/filters/index.js
@@ -78,6 +78,12 @@ export default {
   // links
   absoluteUrl: (url) => (new URL(url, BASE_URL)).toString(),
 
+  // mastodon
+  mastoUsername: (url) => {
+    const url = new URL(post.author.mastodon)
+    return `${url.pathname.replace('/', '')}@${url.host}`
+  },
+
   // feeds
   normalizeEntries: (entries) => {
     const posts = []
diff --git a/package-lock.json b/package-lock.json
index f8f71f57..a14f83d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "coryd.dev",
-  "version": "19.9.17",
+  "version": "19.9.18",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "coryd.dev",
-      "version": "19.9.17",
+      "version": "19.9.18",
       "license": "MIT",
       "dependencies": {
         "@cdransf/api-text": "^1.4.0",
diff --git a/package.json b/package.json
index 653a1d38..04fdea5c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "coryd.dev",
-  "version": "19.9.17",
+  "version": "19.9.18",
   "description": "The source for my personal site. Built using 11ty.",
   "type": "module",
   "scripts": {