diff --git a/tasks/grunt-reg-viz.js b/tasks/grunt-reg-viz.js
index 1674f82..4add774 100644
--- a/tasks/grunt-reg-viz.js
+++ b/tasks/grunt-reg-viz.js
@@ -5,77 +5,77 @@ const os = require('os')
 
 module.exports = function (grunt) {
   grunt.registerMultiTask('reg-viz',
-      'Compares pictures and shows their differences for visual regression test automation.',
-      function () {
-        const done = this.async()
-        const options = this.options({
-          thresholdRate: null,
-          thresholdPixel: null,
-          concurrency: null,
-          enableAntialiasing: false,
-          additionalDetection: 'none',
-          force: false
-        })
-        const data = Object.assign({}, {
-          expected: 'expected',
-          actual: 'actual',
-          different: 'different',
-          report: 'report.html'
-        }, this.data)
-        const report = data.report
-        const force = options.force
-        const warn = force ? grunt.log.warn : grunt.fail.warn
-        let compared = 0
-        const observer = compare({
-          actualDir: data.actual,
-          expectedDir: data.expected,
-          diffDir: data.different,
-          report: report,
-          json: report.replace(/\.html$/, '.json'),
-          update: false,
-          urlPrefix: './',
-          thresholdRate: Number(options.thresholdRate),
-          thresholdPixel: Number(options.thresholdPixel),
-          concurrency: Number(options.concurrency) || os.cpus().length,
-          enableAntialias: !!options.enableAntialiasing,
-          enableClientAdditionalDetection: options.additionalDetection === 'client'
-        })
+    'Compares pictures and shows their differences for visual regression test automation.',
+    function () {
+      const done = this.async()
+      const options = this.options({
+        thresholdRate: null,
+        thresholdPixel: null,
+        concurrency: null,
+        enableAntialiasing: false,
+        additionalDetection: 'none',
+        force: false
+      })
+      const data = Object.assign({}, {
+        expected: 'expected',
+        actual: 'actual',
+        different: 'different',
+        report: 'report.html'
+      }, this.data)
+      const report = data.report
+      const force = options.force
+      const warn = force ? grunt.log.warn : grunt.fail.warn
+      let compared = 0
+      const observer = compare({
+        actualDir: data.actual,
+        expectedDir: data.expected,
+        diffDir: data.different,
+        report: report,
+        json: report.replace(/\.html$/, '.json'),
+        update: false,
+        urlPrefix: './',
+        thresholdRate: Number(options.thresholdRate),
+        thresholdPixel: Number(options.thresholdPixel),
+        concurrency: Number(options.concurrency) || os.cpus().length,
+        enableAntialias: !!options.enableAntialiasing,
+        enableClientAdditionalDetection: options.additionalDetection === 'client'
+      })
 
-        observer.once('start', function () {
-          grunt.verbose.writeln('Comparison started.')
-        })
+      observer.once('start', function () {
+        grunt.verbose.writeln('Comparison started.')
+      })
 
-        observer.on('compare', function (result) {
-          const path = options.actual + result.path
-          ++compared
-          switch (result.type) {
-            case 'pass': return grunt.verbose.writeln(path + ' matched.')
-            case 'fail': return grunt.verbose.writeln(path + ' differed.')
-            case 'delete': return grunt.verbose.writeln(path + ' removed.')
-            case 'new': return grunt.verbose.writeln(path + ' added.')
-          }
-        })
+      observer.on('compare', function (result) {
+        const path = options.actual + result.path
+        ++compared
+        switch (result.type) {
+          case 'pass': return grunt.verbose.writeln(path + ' matched.')
+          case 'fail': return grunt.verbose.writeln(path + ' differed.')
+          case 'delete': return grunt.verbose.writeln(path + ' removed.')
+          case 'new': return grunt.verbose.writeln(path + ' added.')
+        }
+      })
 
-        observer.once('complete', function (result) {
-          const matched = result.passedItems.length
-          const differed = result.failedItems.length
-          const removed = result.deletedItems.length
-          const added = result.newItems.length
-          const ok = differed ? force ? grunt.log.warn : grunt.fail.warn
-                            : grunt.log.ok
-          grunt.verbose.writeln('Comparison finished.')
-          ok(compared + ' ' + grunt.util.pluralize(compared,
-             'image/images') + ' compared, ' + matched + ' matched, ' +
+      observer.once('complete', function (result) {
+        const matched = result.passedItems.length
+        const differed = result.failedItems.length
+        const removed = result.deletedItems.length
+        const added = result.newItems.length
+        const ok = differed ? force ? grunt.log.warn : grunt.fail.warn
+          : grunt.log.ok
+        grunt.verbose.writeln('Comparison finished.')
+        ok(compared + ' ' + grunt.util.pluralize(compared,
+          'image/images') + ' compared, ' + matched + ' matched, ' +
              differed + ' differed, ' + removed + ' removed, ' + added +
              ' added.')
-          done()
-        })
+        done()
+      })
 
-        observer.once('error', function (error) {
-          grunt.verbose.error(error.stack)
-          grunt.log.error(error)
-          warn('Comparing images failed.')
-          done()
-        })
+      observer.once('error', function (error) {
+        grunt.verbose.error(error.stack)
+        grunt.log.error(error)
+        warn('Comparing images failed.')
+        done()
       })
+    })
 }
diff --git a/tests/test.js b/tests/test.js
index f95d094..f68021e 100644
--- a/tests/test.js
+++ b/tests/test.js
@@ -7,9 +7,9 @@ exports['htmllint-html-report-converter'] = {
   matching: function (test) {
     test.expect(2)
     const different = fs.existsSync(path.join(__dirname,
-              'matching/different/todos-1.png'))
+      'matching/different/todos-1.png'))
     const report = fs.existsSync(path.join(__dirname,
-              'matching/report.html'))
+      'matching/report.html'))
     test.ok(!different)
     test.ok(report)
     test.done()
@@ -18,9 +18,9 @@ exports['htmllint-html-report-converter'] = {
   differing: function (test) {
     test.expect(2)
     const different = fs.existsSync(path.join(__dirname,
-              'differing/different/todos-2.png'))
+      'differing/different/todos-2.png'))
     const report = fs.existsSync(path.join(__dirname,
-              'differing/report.html'))
+      'differing/report.html'))
     test.ok(different)
     test.ok(report)
     test.done()