diff --git a/tasks/eslint.js b/tasks/eslint.js
index dab794d..b5ca27a 100644
--- a/tasks/eslint.js
+++ b/tasks/eslint.js
@@ -49,7 +49,7 @@ module.exports = grunt => {
 					results = ESLint.getErrorResults(results);
 				}
 
-				const output = formatter.format(results);
+				const output = await formatter.format(results);
 
 				if (outputFile) {
 					grunt.file.write(outputFile, output);