diff --git a/lib/server/generate.js b/lib/server/generate.js
index 6d78c0b0d3..703ce1b9e8 100644
--- a/lib/server/generate.js
+++ b/lib/server/generate.js
@@ -385,6 +385,19 @@ function execute() {
       fs.copySync(file, targetFile);
     }
   });
+
+  /* Generate CNAME file if the domain is custom */
+  if (!siteConfig.url.includes("github.io")) { // github.io urls are not custom
+    let cname = siteConfig.url;
+    let targetFile =
+      __dirname +
+      "/../../build" +
+      "/" +
+      siteConfig.projectName +
+      "/" +
+      "CNAME";
+    fs.writeFileSync(cname, targetFile);
+  }
 }
 
 module.exports = execute;