diff --git a/src/ol/geom/SimpleGeometry.js b/src/ol/geom/SimpleGeometry.js
index fa85942eb0..097a2cee61 100644
--- a/src/ol/geom/SimpleGeometry.js
+++ b/src/ol/geom/SimpleGeometry.js
@@ -321,7 +321,7 @@ SimpleGeometry.prototype.translate = function(deltaX, deltaY) {
  * @param {Array.<number>=} opt_dest Destination.
  * @return {Array.<number>} Transformed flat coordinates.
  */
-SimpleGeometry.transform2D = function(simpleGeometry, transform, opt_dest) {
+export function transformGeom2D(simpleGeometry, transform, opt_dest) {
   const flatCoordinates = simpleGeometry.getFlatCoordinates();
   if (!flatCoordinates) {
     return null;
@@ -331,5 +331,6 @@ SimpleGeometry.transform2D = function(simpleGeometry, transform, opt_dest) {
       flatCoordinates, 0, flatCoordinates.length, stride,
       transform, opt_dest);
   }
-};
+}
+
 export default SimpleGeometry;
diff --git a/src/ol/render/canvas/Immediate.js b/src/ol/render/canvas/Immediate.js
index 78146ef023..fae21a64e3 100644
--- a/src/ol/render/canvas/Immediate.js
+++ b/src/ol/render/canvas/Immediate.js
@@ -10,7 +10,7 @@ import {equals} from '../../array.js';
 import {asColorLike} from '../../colorlike.js';
 import {intersects} from '../../extent.js';
 import GeometryType from '../../geom/GeometryType.js';
-import SimpleGeometry from '../../geom/SimpleGeometry.js';
+import {transformGeom2D} from '../../geom/SimpleGeometry.js';
 import {transform2D} from '../../geom/flat/transform.js';
 import {CANVAS_LINE_DASH} from '../../has.js';
 import VectorContext from '../VectorContext.js';
@@ -409,7 +409,7 @@ CanvasImmediateRenderer.prototype.drawCircle = function(geometry) {
     if (this.strokeState_) {
       this.setContextStrokeState_(this.strokeState_);
     }
-    const pixelCoordinates = SimpleGeometry.transform2D(
+    const pixelCoordinates = transformGeom2D(
       geometry, this.transform_, this.pixelCoordinates_);
     const dx = pixelCoordinates[2] - pixelCoordinates[0];
     const dy = pixelCoordinates[3] - pixelCoordinates[1];
diff --git a/test/spec/ol/geom/flat/transform.test.js b/test/spec/ol/geom/flat/transform.test.js
index 0ea23ea1b7..913eb9a669 100644
--- a/test/spec/ol/geom/flat/transform.test.js
+++ b/test/spec/ol/geom/flat/transform.test.js
@@ -1,5 +1,5 @@
 import MultiPolygon from '../../../../../src/ol/geom/MultiPolygon.js';
-import SimpleGeometry from '../../../../../src/ol/geom/SimpleGeometry.js';
+import {transformGeom2D} from '../../../../../src/ol/geom/SimpleGeometry.js';
 import {rotate, translate} from '../../../../../src/ol/geom/flat/transform.js';
 
 
@@ -31,8 +31,7 @@ describe('ol.geom.flat.transform', function() {
         0, -0.0004088332670837288,
         4480.991370439071, 1529.5752568707105
       ];
-      const pixelCoordinates = SimpleGeometry.transform2D(
-        multiPolygonGeometry, transform, []);
+      const pixelCoordinates = transformGeom2D(multiPolygonGeometry, transform, []);
       expect(pixelCoordinates[0]).to.roughlyEqual(806.6035275946265, 1e-9);
       expect(pixelCoordinates[1]).to.roughlyEqual(160.48916296287916, 1e-9);
       expect(pixelCoordinates[2]).to.roughlyEqual(805.3521540835154, 1e-9);