diff --git a/src/ol/format/mvtformat.js b/src/ol/format/mvtformat.js
index f625c0ed2b..bde6709e2a 100644
--- a/src/ol/format/mvtformat.js
+++ b/src/ol/format/mvtformat.js
@@ -207,11 +207,11 @@ ol.format.MVT.prototype.setLayers = function(layers) {
 ol.format.MVT.calculateFlatCoordinates_ = function(
     coords, flatCoordinates, ends) {
   var end = 0;
-  var line, coord;
   for (var i = 0, ii = coords.length; i < ii; ++i) {
-    line = coords[i];
-    for (var j = 0, jj = line.length; j < jj; ++j) {
-      coord = line[j];
+    var line = coords[i];
+    var j, jj;
+    for (j = 0, jj = line.length; j < jj; ++j) {
+      var coord = line[j];
       // Non-tilespace coords can be calculated here when a TileGrid and
       // TileCoord are known.
       flatCoordinates.push(coord.x, coord.y);
diff --git a/src/ol/interaction/modifyinteraction.js b/src/ol/interaction/modifyinteraction.js
index 24d5a55000..806099d45a 100644
--- a/src/ol/interaction/modifyinteraction.js
+++ b/src/ol/interaction/modifyinteraction.js
@@ -600,8 +600,8 @@ ol.interaction.Modify.handleDownEvent_ = function(evt) {
     if (insertVertices.length) {
       this.willModifyFeatures_(evt);
     }
-    for (i = insertVertices.length - 1; i >= 0; --i) {
-      this.insertVertex_.apply(this, insertVertices[i]);
+    for (var j = insertVertices.length - 1; j >= 0; --j) {
+      this.insertVertex_.apply(this, insertVertices[j]);
     }
   }
   return !!this.vertexFeature_;