diff --git a/gulpfile.js b/gulpfile.js
index daa7d9efd..99ca22133 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1160,7 +1160,8 @@ gulp.task('lint', function (done) {
   console.log('### Linting JS files');
 
   // Ensure that we lint the Firefox specific *.jsm files too.
-  var options = ['node_modules/eslint/bin/eslint', '--ext', '.js,.jsm', '.'];
+  var options = ['node_modules/eslint/bin/eslint', '--ext', '.js,.jsm', '.',
+                 '--report-unused-disable-directives'];
   var esLintProcess = spawn('node', options, { stdio: 'inherit', });
   esLintProcess.on('close', function (code) {
     if (code !== 0) {
diff --git a/src/doc_helper.js b/src/doc_helper.js
index d6707e3a3..86632b455 100644
--- a/src/doc_helper.js
+++ b/src/doc_helper.js
@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* eslint-disable strict */
 
 /*
  NOTE: This file is created as a helper to assist with JSDoc html files.
diff --git a/src/pdf.worker.entry.js b/src/pdf.worker.entry.js
index 1950ad7de..2847f1b80 100644
--- a/src/pdf.worker.entry.js
+++ b/src/pdf.worker.entry.js
@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* eslint-disable strict */
 
 (typeof window !== 'undefined' ? window : {}).pdfjsDistBuildPdfWorker =
   require('./pdf.worker.js');