diff --git a/libs/native-federation/src/builders/build/builder.ts b/libs/native-federation/src/builders/build/builder.ts
index 2b2f5c22..334ef1d1 100644
--- a/libs/native-federation/src/builders/build/builder.ts
+++ b/libs/native-federation/src/builders/build/builder.ts
@@ -117,11 +117,6 @@ export async function* runBuilder(
     return;
   }
 
-  let options = (await context.validateOptions(
-    targetOptions,
-    builder
-  )) as JsonObject & ApplicationBuilderOptions;
-
   /**
    * Explicitly defined as devServer or if the target contains "serve"
    */
@@ -130,6 +125,16 @@ export async function* runBuilder(
       ? !!nfOptions.devServer
       : target.target.includes('serve');
 
+  let options = (await context.validateOptions(
+    runServer
+      ? {
+          ...targetOptions,
+          port: nfOptions.port || targetOptions['port'],
+        }
+      : targetOptions,
+    builder
+  )) as JsonObject & ApplicationBuilderOptions;
+
   let serverOptions = null;
 
   const write = true;