diff --git a/src/basic/Line.js b/src/basic/Line.js
index 15224a70..d09247ca 100644
--- a/src/basic/Line.js
+++ b/src/basic/Line.js
@@ -34,15 +34,16 @@ var Line = this.Line = Base.extend(/** @lends Line# */{
 		// intersection outside the line segment are allowed.
 		// With two parameters, the 2nd parameter is a direction, and infinite
 		// is automatially true, since we're describing an infinite line.
-		point1 = Point.read(arguments);
-		point2 = Point.read(arguments);
-		if (arguments.length == 3) {
-			this.point = point1;
-			this.vector = point2.subtract(point1);
-			this.infinite = infinite;
+		var _point1 = Point.read(arguments),
+			_point2 = Point.read(arguments),
+			_infinite = Base.readValue(arguments);
+		if (_infinite !== undefined) {
+			this.point = _point1;
+			this.vector = _point2.subtract(_point1);
+			this.infinite = _infinite;
 		} else {
-			this.point = point1;
-			this.vector = point2;
+			this.point = _point1;
+			this.vector = _point2;
 			this.infinite = true;
 		}
 	},