diff --git a/package.json b/package.json
index 2639d3b9..bf87e2dd 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "postinstall": "node scripts/patch-lightningcss.mjs && node scripts/patch-endpoint-media-scope.mjs && node scripts/patch-endpoint-media-sharp-runtime.mjs && node scripts/patch-frontend-sharp-runtime.mjs && node scripts/patch-endpoint-files-upload-route.mjs && node scripts/patch-endpoint-files-upload-locales.mjs && node scripts/patch-endpoint-activitypub-locales.mjs && node scripts/patch-endpoint-activitypub-docloader-loglevel.mjs && node scripts/patch-endpoint-homepage-locales.mjs && node scripts/patch-federation-unlisted-guards.mjs && node scripts/patch-endpoint-micropub-where-note-visibility.mjs && node scripts/patch-endpoint-posts-ai-fields.mjs && node scripts/patch-endpoint-podroll-opml-upload.mjs && node scripts/patch-preset-eleventy-ai-frontmatter.mjs && node scripts/patch-frontend-serviceworker-file.mjs && node scripts/patch-conversations-collection-guards.mjs && node scripts/patch-conversations-mastodon-disconnect.mjs && node scripts/patch-indiekit-routes-rate-limits.mjs && node scripts/patch-indiekit-error-production-stack.mjs && node scripts/patch-indieauth-devmode-guard.mjs && node scripts/patch-listening-endpoint-runtime-guards.mjs",
-    "serve": "export NODE_ENV=${NODE_ENV:-production} INDIEKIT_DEBUG=${INDIEKIT_DEBUG:-0} && node scripts/preflight-production-security.mjs && node scripts/preflight-mongo-connection.mjs && node scripts/preflight-activitypub-rsa-key.mjs && node scripts/preflight-activitypub-profile-urls.mjs && node scripts/patch-lightningcss.mjs && node scripts/patch-endpoint-media-scope.mjs && node scripts/patch-endpoint-media-sharp-runtime.mjs && node scripts/patch-frontend-sharp-runtime.mjs && node scripts/patch-endpoint-files-upload-route.mjs && node scripts/patch-endpoint-files-upload-locales.mjs && node scripts/patch-endpoint-activitypub-locales.mjs && node scripts/patch-endpoint-activitypub-docloader-loglevel.mjs && node scripts/patch-endpoint-homepage-locales.mjs && node scripts/patch-federation-unlisted-guards.mjs && node scripts/patch-endpoint-micropub-where-note-visibility.mjs && node scripts/patch-endpoint-posts-ai-fields.mjs && node scripts/patch-endpoint-podroll-opml-upload.mjs && node scripts/patch-preset-eleventy-ai-frontmatter.mjs && node scripts/patch-frontend-serviceworker-file.mjs && node scripts/patch-conversations-collection-guards.mjs && node scripts/patch-conversations-mastodon-disconnect.mjs && node scripts/patch-indiekit-routes-rate-limits.mjs && node scripts/patch-indiekit-error-production-stack.mjs && node scripts/patch-indieauth-devmode-guard.mjs && node scripts/patch-listening-endpoint-runtime-guards.mjs && node node_modules/@indiekit/indiekit/bin/cli.js serve --config indiekit.config.mjs",
+    "postinstall": "node scripts/patch-lightningcss.mjs && node scripts/patch-endpoint-media-scope.mjs && node scripts/patch-endpoint-media-sharp-runtime.mjs && node scripts/patch-frontend-sharp-runtime.mjs && node scripts/patch-endpoint-files-upload-route.mjs && node scripts/patch-endpoint-files-upload-locales.mjs && node scripts/patch-endpoint-activitypub-locales.mjs && node scripts/patch-endpoint-activitypub-docloader-loglevel.mjs && node scripts/patch-endpoint-activitypub-migrate-alias-clear.mjs && node scripts/patch-endpoint-homepage-locales.mjs && node scripts/patch-federation-unlisted-guards.mjs && node scripts/patch-endpoint-micropub-where-note-visibility.mjs && node scripts/patch-endpoint-posts-ai-fields.mjs && node scripts/patch-endpoint-podroll-opml-upload.mjs && node scripts/patch-preset-eleventy-ai-frontmatter.mjs && node scripts/patch-frontend-serviceworker-file.mjs && node scripts/patch-conversations-collection-guards.mjs && node scripts/patch-conversations-mastodon-disconnect.mjs && node scripts/patch-indiekit-routes-rate-limits.mjs && node scripts/patch-indiekit-error-production-stack.mjs && node scripts/patch-indieauth-devmode-guard.mjs && node scripts/patch-listening-endpoint-runtime-guards.mjs",
+    "serve": "export NODE_ENV=${NODE_ENV:-production} INDIEKIT_DEBUG=${INDIEKIT_DEBUG:-0} && node scripts/preflight-production-security.mjs && node scripts/preflight-mongo-connection.mjs && node scripts/preflight-activitypub-rsa-key.mjs && node scripts/preflight-activitypub-profile-urls.mjs && node scripts/patch-lightningcss.mjs && node scripts/patch-endpoint-media-scope.mjs && node scripts/patch-endpoint-media-sharp-runtime.mjs && node scripts/patch-frontend-sharp-runtime.mjs && node scripts/patch-endpoint-files-upload-route.mjs && node scripts/patch-endpoint-files-upload-locales.mjs && node scripts/patch-endpoint-activitypub-locales.mjs && node scripts/patch-endpoint-activitypub-docloader-loglevel.mjs && node scripts/patch-endpoint-activitypub-migrate-alias-clear.mjs && node scripts/patch-endpoint-homepage-locales.mjs && node scripts/patch-federation-unlisted-guards.mjs && node scripts/patch-endpoint-micropub-where-note-visibility.mjs && node scripts/patch-endpoint-posts-ai-fields.mjs && node scripts/patch-endpoint-podroll-opml-upload.mjs && node scripts/patch-preset-eleventy-ai-frontmatter.mjs && node scripts/patch-frontend-serviceworker-file.mjs && node scripts/patch-conversations-collection-guards.mjs && node scripts/patch-conversations-mastodon-disconnect.mjs && node scripts/patch-indiekit-routes-rate-limits.mjs && node scripts/patch-indiekit-error-production-stack.mjs && node scripts/patch-indieauth-devmode-guard.mjs && node scripts/patch-listening-endpoint-runtime-guards.mjs && node node_modules/@indiekit/indiekit/bin/cli.js serve --config indiekit.config.mjs",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
diff --git a/scripts/patch-endpoint-activitypub-migrate-alias-clear.mjs b/scripts/patch-endpoint-activitypub-migrate-alias-clear.mjs
new file mode 100644
index 00000000..febea539
--- /dev/null
+++ b/scripts/patch-endpoint-activitypub-migrate-alias-clear.mjs
@@ -0,0 +1,107 @@
+import { access, readFile, writeFile } from "node:fs/promises";
+
+const patchSpecs = [
+  {
+    name: "activitypub-migrate-alias-clear",
+    marker: "allow clearing alsoKnownAs alias by submitting empty value",
+    oldSnippet: `      const aliasUrl = request.body.aliasUrl?.trim();
+      if (aliasUrl && profileCollection) {
+        await profileCollection.updateOne(
+          {},
+          { $set: { alsoKnownAs: [aliasUrl] } },
+          { upsert: true },
+        );
+        result = {
+          type: "success",
+          text: response.locals.__("activitypub.migrate.aliasSuccess"),
+        };
+      }`,
+    newSnippet: `      const aliasUrl = request.body.aliasUrl?.trim();
+      const submittedAliasField = Object.prototype.hasOwnProperty.call(
+        request.body || {},
+        "aliasUrl",
+      );
+
+      // allow clearing alsoKnownAs alias by submitting empty value
+      if (profileCollection && submittedAliasField) {
+        if (aliasUrl) {
+          await profileCollection.updateOne(
+            {},
+            { $set: { alsoKnownAs: [aliasUrl] } },
+            { upsert: true },
+          );
+          result = {
+            type: "success",
+            text: response.locals.__("activitypub.migrate.aliasSuccess"),
+          };
+        } else {
+          await profileCollection.updateOne(
+            {},
+            { $set: { alsoKnownAs: [] } },
+            { upsert: true },
+          );
+          result = {
+            type: "success",
+            text: "Alias removed - alsoKnownAs is now empty.",
+          };
+        }
+      }`,
+    candidates: [
+      "node_modules/@rmdes/indiekit-endpoint-activitypub/lib/controllers/migrate.js",
+      "node_modules/@indiekit/indiekit/node_modules/@rmdes/indiekit-endpoint-activitypub/lib/controllers/migrate.js",
+    ],
+  },
+];
+
+async function exists(filePath) {
+  try {
+    await access(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+let filesChecked = 0;
+let filesPatched = 0;
+
+for (const spec of patchSpecs) {
+  let foundAnyTarget = false;
+
+  for (const filePath of spec.candidates) {
+    if (!(await exists(filePath))) {
+      continue;
+    }
+
+    foundAnyTarget = true;
+    filesChecked += 1;
+
+    const source = await readFile(filePath, "utf8");
+
+    if (source.includes(spec.marker)) {
+      continue;
+    }
+
+    if (!source.includes(spec.oldSnippet)) {
+      continue;
+    }
+
+    const updated = source.replace(spec.oldSnippet, spec.newSnippet);
+    await writeFile(filePath, updated, "utf8");
+    filesPatched += 1;
+  }
+
+  if (!foundAnyTarget) {
+    console.log(`[postinstall] ${spec.name}: no target files found`);
+  }
+}
+
+if (filesChecked === 0) {
+  console.log("[postinstall] No activitypub migrate alias files found");
+} else if (filesPatched === 0) {
+  console.log("[postinstall] activitypub migrate alias clear already patched");
+} else {
+  console.log(
+    `[postinstall] Patched activitypub migrate alias clear in ${filesPatched}/${filesChecked} file(s)`,
+  );
+}
diff --git a/start.example.sh b/start.example.sh
index 630d0bd7..af3b1c2c 100644
--- a/start.example.sh
+++ b/start.example.sh
@@ -60,6 +60,7 @@ unset DEBUG
 /usr/local/bin/node scripts/patch-endpoint-files-upload-locales.mjs
 /usr/local/bin/node scripts/patch-endpoint-activitypub-locales.mjs
 /usr/local/bin/node scripts/patch-endpoint-activitypub-docloader-loglevel.mjs
+/usr/local/bin/node scripts/patch-endpoint-activitypub-migrate-alias-clear.mjs
 /usr/local/bin/node scripts/patch-endpoint-homepage-locales.mjs
 /usr/local/bin/node scripts/patch-frontend-serviceworker-file.mjs
 /usr/local/bin/node scripts/patch-conversations-collection-guards.mjs