diff --git a/lib/bootstrap.js b/lib/bootstrap.js
index 5f1fd0bc..7405e72d 100644
--- a/lib/bootstrap.js
+++ b/lib/bootstrap.js
@@ -166,7 +166,7 @@ var Base = this.Base = new function() {
 
 	function each(iter, bind, asArray) {
 		try {
-			(asArray || asArray == undefined && isArray(this) ? forEach : forIn)
+			(asArray || asArray === undefined && isArray(this) ? forEach : forIn)
 				.call(this, iterator(iter), bind = bind || this);
 		} catch (e) {
 			if (e !== Base.stop) throw e;
diff --git a/src/path/Curve.js b/src/path/Curve.js
index 8c923c8a..63968a87 100644
--- a/src/path/Curve.js
+++ b/src/path/Curve.js
@@ -174,7 +174,7 @@ var Curve = this.Curve = Base.extend({
 	getParameter: function(length, t) {
 		var args = this.getCurveValues();
 		args.push(length);
-		args.push(t == undefined ? length < 0 ? 1 : 0 : t);
+		args.push(t === undefined ? length < 0 ? 1 : 0 : t);
 		return Curve.getParameter.apply(Curve, args);
 	},
 
@@ -310,9 +310,9 @@ var Curve = this.Curve = Base.extend({
 
 		statics: {
 			getLength: function(p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y, a, b) {
-				if (a == undefined)
+				if (a === undefined)
 					a = 0;
-				if (b == undefined)
+				if (b === undefined)
 					b = 1;
 				if (p1x == c1x && p1y == c1y && p2x == c2x && p2y == c2y) {
 					// Straight line
diff --git a/src/path/Path.js b/src/path/Path.js
index 076efdf8..bab85186 100644
--- a/src/path/Path.js
+++ b/src/path/Path.js
@@ -101,7 +101,7 @@ var Path = this.Path = PathItem.extend({
 		if (segment._path)
 			segment = new Segment(segment);
 		segment._path = this;
-		if (index == undefined) {
+		if (index === undefined) {
 			this._segments.push(segment);
 		} else {
 			this._segments.splice(index, 0, segment);