diff --git a/src/ol/base/extent.js b/src/ol/base/extent.js
index 2e82fcba09..dc6288ae7b 100644
--- a/src/ol/base/extent.js
+++ b/src/ol/base/extent.js
@@ -49,11 +49,11 @@ ol.Extent.prototype.clone = function() {
 
 
 /**
- * @param {ol.TransformFunction} transform Transform.
+ * @param {ol.TransformFunction} transformFn Transform function.
  * @return {ol.Extent} Extent.
  */
-ol.Extent.prototype.transform = function(transform) {
-  var min = transform(new ol.Coordinate(this.minX, this.minY));
-  var max = transform(new ol.Coordinate(this.maxX, this.maxY));
+ol.Extent.prototype.transform = function(transformFn) {
+  var min = transformFn(new ol.Coordinate(this.minX, this.minY));
+  var max = transformFn(new ol.Coordinate(this.maxX, this.maxY));
   return new ol.Extent(min.x, min.y, max.x, max.y);
 };
diff --git a/src/ol/base/extent_test.js b/src/ol/base/extent_test.js
index 4cf509f607..4a5554e9ec 100644
--- a/src/ol/base/extent_test.js
+++ b/src/ol/base/extent_test.js
@@ -16,9 +16,10 @@ function testClone() {
 
 
 function testTransform() {
-  var transform = ol.Projection.getTransformFromCodes('EPSG:4326', 'EPSG:3857');
+  var transformFn =
+      ol.Projection.getTransformFromCodes('EPSG:4326', 'EPSG:3857');
   var sourceExtent = new ol.Extent(-15, -30, 45, 60);
-  var destinationExtent = sourceExtent.transform(transform);
+  var destinationExtent = sourceExtent.transform(transformFn);
   assertNotNullNorUndefined(destinationExtent);
   // FIXME check values with third-party tool
   assertRoughlyEquals(-1669792.3618991037, destinationExtent.minX, 1e-9);
diff --git a/src/ol/base/projection.js b/src/ol/base/projection.js
index 84ce030a80..66e1f24424 100644
--- a/src/ol/base/projection.js
+++ b/src/ol/base/projection.js
@@ -140,9 +140,9 @@ ol.Projection.addProjections = function(projections) {
 /**
  * @param {ol.Projection} source Source.
  * @param {ol.Projection} destination Destination.
- * @param {ol.TransformFunction} transform Transform.
+ * @param {ol.TransformFunction} transformFn Transform.
  */
-ol.Projection.addTransform = function(source, destination, transform) {
+ol.Projection.addTransform = function(source, destination, transformFn) {
   var projections = ol.Projection.projections_;
   var sourceCode = source.getCode();
   goog.asserts.assert(goog.object.containsKey(projections, sourceCode));
@@ -154,7 +154,7 @@ ol.Projection.addTransform = function(source, destination, transform) {
   }
   goog.asserts.assert(
       !goog.object.containsKey(transforms[sourceCode], destinationCode));
-  transforms[sourceCode][destinationCode] = transform;
+  transforms[sourceCode][destinationCode] = transformFn;
 };
 
 
@@ -180,8 +180,8 @@ ol.Projection.equivalent = function(projection1, projection2) {
   } else if (projection1.getUnits() != projection2.getUnits()) {
     return false;
   } else {
-    var transform = ol.Projection.getTransform(projection1, projection2);
-    return transform === ol.Projection.cloneTransform;
+    var transformFn = ol.Projection.getTransform(projection1, projection2);
+    return transformFn === ol.Projection.cloneTransform;
   }
 };
 
@@ -239,8 +239,8 @@ ol.Projection.cloneTransform = function(point) {
  * @return {ol.Coordinate} Point.
  */
 ol.Projection.transform = function(point, source, destination) {
-  var transform = ol.Projection.getTransform(source, destination);
-  return transform(point);
+  var transformFn = ol.Projection.getTransform(source, destination);
+  return transformFn(point);
 };
 
 
@@ -252,9 +252,9 @@ ol.Projection.transform = function(point, source, destination) {
  */
 ol.Projection.transformWithCodes =
     function(point, sourceCode, destinationCode) {
-  var transform = ol.Projection.getTransformFromCodes(
+  var transformFn = ol.Projection.getTransformFromCodes(
       sourceCode, destinationCode);
-  return transform(point);
+  return transformFn(point);
 };
 
 
diff --git a/src/ol/tile/tileurlfunction.js b/src/ol/tile/tileurlfunction.js
index fb1825393b..6a68d92821 100644
--- a/src/ol/tile/tileurlfunction.js
+++ b/src/ol/tile/tileurlfunction.js
@@ -64,17 +64,17 @@ ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord) {
 
 
 /**
- * @param {function(ol.TileCoord): ol.TileCoord} transform Transform.
+ * @param {function(ol.TileCoord): ol.TileCoord} transformFn Transform.function.
  * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
  * @return {ol.TileUrlFunctionType} Tile URL function.
  */
 ol.TileUrlFunction.withTileCoordTransform =
-    function(transform, tileUrlFunction) {
+    function(transformFn, tileUrlFunction) {
   return function(tileCoord) {
     if (goog.isNull(tileCoord)) {
       return undefined;
     } else {
-      return tileUrlFunction(transform(tileCoord));
+      return tileUrlFunction(transformFn(tileCoord));
     }
   };
 };