diff --git a/js/grunt/requirejsBuild.js b/js/grunt/requirejsBuild.js
index 4de231d31..3d46c5608 100644
--- a/js/grunt/requirejsBuild.js
+++ b/js/grunt/requirejsBuild.js
@@ -15,12 +15,6 @@ var assert = require( 'assert' );
 module.exports = function( grunt, buildConfig ) {
   'use strict';
 
-  // Validate phet-io brand naming, see https://github.com/phetsims/chipper/issues/504
-  if ( buildConfig.brand === 'phet-io' ) {
-    assert( buildConfig.version.indexOf( 'phetio' ) >= 0, 'phet-io branded things must have phetio in the string so they will be ' +
-                                                          'properly dealt with on build-server' );
-  }
-
   if ( buildConfig.brand === 'phet' ) {
     assert( buildConfig.version.indexOf( 'phetio' ) === -1, 'phet versions cannot be named like phet-io versions' );
   }