diff --git a/src/ol/extent.js b/src/ol/extent.js
index 19a4c8a617..e071c81355 100644
--- a/src/ol/extent.js
+++ b/src/ol/extent.js
@@ -4,7 +4,6 @@ goog.provide('ol.extent.Corner');
 goog.provide('ol.extent.Relationship');
 
 goog.require('goog.asserts');
-goog.require('goog.vec.Mat4');
 goog.require('ol.Coordinate');
 goog.require('ol.Size');
 goog.require('ol.TransformFunction');
@@ -878,37 +877,3 @@ ol.extent.applyTransform = function(extent, transformFn, opt_extent) {
   var ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];
   return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
 };
-
-
-/**
- * Apply a 2d transform to an extent.
- * @param {ol.Extent} extent Input extent.
- * @param {goog.vec.Mat4.Number} transform The transform matrix.
- * @param {ol.Extent=} opt_extent Optional extent for return values.
- * @return {ol.Extent} The transformed extent.
- */
-ol.extent.transform2D = function(extent, transform, opt_extent) {
-  var dest = opt_extent ? opt_extent : [];
-  var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
-  var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
-  var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
-  var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
-  var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
-  var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
-  var xi = [0, 2, 0, 2];
-  var yi = [1, 1, 3, 3];
-  var xs = [];
-  var ys = [];
-  var i, x, y;
-  for (i = 0; i < 4; ++i) {
-    x = extent[xi[i]];
-    y = extent[yi[i]];
-    xs[i] = m00 * x + m01 * y + m03;
-    ys[i] = m10 * x + m11 * y + m13;
-  }
-  dest[0] = Math.min.apply(null, xs);
-  dest[1] = Math.min.apply(null, ys);
-  dest[2] = Math.max.apply(null, xs);
-  dest[3] = Math.max.apply(null, ys);
-  return dest;
-};
diff --git a/test/spec/ol/extent.test.js b/test/spec/ol/extent.test.js
index de372d3f67..dfeb399716 100644
--- a/test/spec/ol/extent.test.js
+++ b/test/spec/ol/extent.test.js
@@ -861,46 +861,6 @@ describe('ol.extent', function() {
 
   });
 
-  describe('transform2D()', function() {
-
-    var extent;
-    beforeEach(function() {
-      extent = [-180, -90, 180, 90];
-    });
-
-    it('applies a translate transform', function() {
-      var mat = goog.vec.Mat4.createNumber();
-      goog.vec.Mat4.makeTranslate(mat, 10, 20, 0);
-      var transformed = ol.extent.transform2D(extent, mat);
-      expect(transformed).to.eql([-170, -70, 190, 110]);
-    });
-
-    it('applies a rotate transform', function() {
-      var mat = goog.vec.Mat4.createNumber();
-      goog.vec.Mat4.makeRotateZ(mat, Math.PI / 2);
-      var transformed = ol.extent.transform2D(extent, mat);
-      expect(transformed[0]).to.roughlyEqual(-90, 1e-5);
-      expect(transformed[1]).to.roughlyEqual(-180, 1e-5);
-      expect(transformed[2]).to.roughlyEqual(90, 1e-5);
-      expect(transformed[3]).to.roughlyEqual(180, 1e-5);
-    });
-
-    it('does not modify original', function() {
-      var mat = goog.vec.Mat4.createNumber();
-      goog.vec.Mat4.makeRotateZ(mat, Math.PI / 2);
-      ol.extent.transform2D(extent, mat);
-      expect(extent).to.eql([-180, -90, 180, 90]);
-    });
-
-    it('accepts an extent to modify', function() {
-      var mat = goog.vec.Mat4.createNumber();
-      goog.vec.Mat4.makeScale(mat, 2, 0.5);
-      ol.extent.transform2D(extent, mat, extent);
-      expect(extent).to.eql([-360, -45, 360, 45]);
-    });
-
-  });
-
 });