diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index 349b6b1791b4ca6343d0063689b84d5dd9244b03..da2fff933a5ed2b56849d30c36f8c5216e962a79 100644
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -34,7 +34,7 @@ module.exports = (grunt) ->
 
             livereload:
                 options:
-                    port: 80
+                    port: process.env.PORT || 80
                     # Change hostname to '0.0.0.0' to access
                     # the server from outside.
                     hostname: '0.0.0.0'