diff --git a/aio/content/guide/build.md b/aio/content/guide/build.md
index 843f0d9130..ed37a6fa3c 100644
--- a/aio/content/guide/build.md
+++ b/aio/content/guide/build.md
@@ -54,7 +54,7 @@ The following sets content sets default values for the production build target:
 
 ```
 export const environment = {
-  production: true
+  production: true,
   apiUrl: 'http://my-prod-url'
 };
 ```