diff --git a/Build/build-internal-rules.js b/Build/build-internal-rules.js
index 381ba8cb..4079d60e 100644
--- a/Build/build-internal-rules.js
+++ b/Build/build-internal-rules.js
@@ -4,9 +4,21 @@ const fse = require('fs-extra');
 const path = require('path');
 const readline = require('readline');
 const { isDomainLoose } = require('./lib/is-domain-loose');
+const tldts = require('tldts');
+
+
 
 (async () => {
-  const results = [];
+  const set = new Set();
+  /**
+   * @param {string} input
+   */
+  const addApexDomain = (input) => {
+    const d = tldts.getDomain(input, { allowPrivateDomains: true });
+    if (d) {
+      set.add(d);
+    }
+  };
 
   for await (
     const line of readline.createInterface({
@@ -15,9 +27,9 @@ const { isDomainLoose } = require('./lib/is-domain-loose');
     })
   ) {
     if (line.startsWith('DOMAIN-SUFFIX,')) {
-      results.push(line.replace('DOMAIN-SUFFIX,', 'SUFFIX,'));
+      addApexDomain(line.replace('DOMAIN-SUFFIX,', ''))
     } else if (line.startsWith('DOMAIN,')) {
-      results.push(line.replace('DOMAIN,', 'SUFFIX,'));
+      addApexDomain(line.replace('DOMAIN,', ''));
     }
   }
 
@@ -28,9 +40,9 @@ const { isDomainLoose } = require('./lib/is-domain-loose');
     })
   ) {
     if (line[0] === '.') {
-      results.push(`SUFFIX,${line.slice(1)}`);
+      addApexDomain(line.slice(1));
     } else if (isDomainLoose(line)) {
-      results.push(`SUFFIX,${line}`);
+      addApexDomain(line);
     }
   }
 
@@ -41,17 +53,15 @@ const { isDomainLoose } = require('./lib/is-domain-loose');
     })
   ) {
     if (line[0] === '.') {
-      results.push(`SUFFIX,${line.slice(1)}`);
+      addApexDomain(line.slice(1));
     } else if (isDomainLoose(line)) {
-      results.push(`SUFFIX,${line}`);
+      addApexDomain(line);
     }
   }
 
-  results.push('');
-
   await fse.ensureDir(path.resolve(__dirname, '../List/internal'));
   await fs.promises.writeFile(
     path.resolve(__dirname, '../List/internal/cdn.csv'),
-    results.join('\n')
+    Array.from(set).map(i => `SUFFIX,${i}`).join('\n') + '\n'
   );
 })();
diff --git a/package.json b/package.json
index f883e75e..d2c72bc1 100644
--- a/package.json
+++ b/package.json
@@ -64,12 +64,19 @@
         "download-previous-build"
       ]
     },
+    "build:internal-rules": {
+      "command": "node ./Build/build-internal-rules.js",
+      "dependencies": [
+        "build:cdn-conf"
+      ]
+    },
     "build:public": {
       "command": "node ./Build/build-public.js",
       "dependencies": [
         "build:anti-bogus-domain",
         "build:apple-cdn",
         "build:cdn-conf",
+        "build:internal-rules",
         "build:reject-domainset",
         "build:telegram-cidr"
       ]
@@ -83,12 +90,6 @@
         "build:cdn-conf"
       ]
     },
-    "build:internal-rules": {
-      "command": "node ./Build/build-internal-rules.js",
-      "dependencies": [
-        "build:cdn-conf"
-      ]
-    },
     "build": {
       "dependencies": [
         "build:anti-bogus-domain",
@@ -97,6 +98,7 @@
         "build:reject-domainset",
         "build:telegram-cidr",
         "build:chn-cidr",
+        "build:internal-rules",
         "build:public",
         "validate:domainset"
       ]