diff --git a/lib/filter.js b/lib/filter.js
index e880f13..e245205 100755
--- a/lib/filter.js
+++ b/lib/filter.js
@@ -69,7 +69,7 @@ var pixelBppMap = {
         0: 0,
         1: 0,
         2: 0,
-        3: 0xff,
+        3: 0xff
     },
     2: { // LA
         0: 0,
@@ -98,7 +98,7 @@ Filter.prototype._reverseFilterLine = function(rawData) {
         pxRowPos = this._line * pxLineLength,
         filter = rawData[0];
 
-    if (filter == 0) {
+    if (filter === 0) {
         for (var x = 0; x < this._width; x++) {
             var pxPos = pxRowPos + (x << 2),
                 rawPos = 1 + x * this._Bpp;