diff --git a/src/core/cmap.js b/src/core/cmap.js
index 1bbc0e473d023..34049c4854508 100644
--- a/src/core/cmap.js
+++ b/src/core/cmap.js
@@ -359,10 +359,10 @@ var BinaryCMapReader = (function BinaryCMapReaderClosure() {
   function hexToStr(a, size) {
     // This code is hot. Special-case some common values to avoid creating an
     // object with subarray().
-    if (size == 1) {
+    if (size === 1) {
       return String.fromCharCode(a[0], a[1]);
     }
-    if (size == 3) {
+    if (size === 3) {
       return String.fromCharCode(a[0], a[1], a[2], a[3]);
     }
     return String.fromCharCode.apply(null, a.subarray(0, size + 1));