diff --git a/src/layer/vector/Polyline.js b/src/layer/vector/Polyline.js
index 573d8888..c52d32cd 100644
--- a/src/layer/vector/Polyline.js
+++ b/src/layer/vector/Polyline.js
@@ -47,7 +47,7 @@ L.Polyline = L.Path.extend({
 
 	spliceLatLngs: function () { // (Number index, Number howMany)
 		var removed = [].splice.apply(this._latlngs, arguments);
-		this._convertLatLngs(this._latlngs);
+		this._convertLatLngs(this._latlngs, true);
 		this.redraw();
 		return removed;
 	},
@@ -85,11 +85,11 @@ L.Polyline = L.Path.extend({
 		return bounds;
 	},
 
-	_convertLatLngs: function (latlngs) {
-		var i, len, target = [];
+	_convertLatLngs: function (latlngs, overwrite) {
+		var i, len, target = overwrite ? latlngs : [];
 
 		for (i = 0, len = latlngs.length; i < len; i++) {
-			if (L.Util.isArray(latlngs[i]) && typeof latlngs[i][0] !== 'number') {
+			if (L.Util.isArray(latlngs[i]) && typeof latlngs[i][0] !== 'number') {
 				return;
 			}
 			target[i] = L.latLng(latlngs[i]);