diff --git a/Gruntfile.js b/Gruntfile.js
index cdb5b91f3..1ed341f9c 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,23 +1,17 @@
 /* eslint-env node */
 module.exports = function ( grunt ) {
-	const messagesDirs = grunt.file.readJSON( 'extension.json' ).MessagesDirs;
-
-	const subExtensions = [
+	const messagesDirs = require( './extension.json' ).MessagesDirs;
+	for ( const subExtension of [
 		'QuestyCaptcha',
 		'ReCaptchaNoCaptcha',
 		'FancyCaptcha',
 		'MathCaptcha',
 		'hCaptcha'
-	];
-
-	subExtensions.forEach(
-		function ( subExtension ) {
-			messagesDirs[ subExtension ] = grunt.file.readJSON( subExtension + '/extension.json' ).MessagesDirs[ subExtension ].map(
-				function ( path ) {
-					return subExtension + '/' + path;
-				}
-			);
-		} );
+	] ) {
+		messagesDirs[ subExtension ] = require( './' + subExtension + '/extension.json' )
+			.MessagesDirs[ subExtension ]
+			.map( function ( path ) { return subExtension + '/' + path; } );
+	}
 
 	grunt.loadNpmTasks( 'grunt-banana-checker' );
 	grunt.loadNpmTasks( 'grunt-eslint' );