diff --git a/src/ol/proj/epsg3857.js b/src/ol/proj/epsg3857.js
index 0235f69223..9cd1c1684a 100644
--- a/src/ol/proj/epsg3857.js
+++ b/src/ol/proj/epsg3857.js
@@ -1,7 +1,6 @@
 /**
  * @module ol/proj/epsg3857
  */
-import {inherits} from '../util.js';
 import {cosh} from '../math.js';
 import Projection from '../proj/Projection.js';
 import Units from '../proj/Units.js';
@@ -43,16 +42,14 @@ export const WORLD_EXTENT = [-180, -85, 180, 85];
 /**
  * @classdesc
  * Projection object for web/spherical Mercator (EPSG:3857).
- *
- * @extends {module:ol/proj/Projection}
  */
-class EPSG3857Projection {
+class EPSG3857Projection extends Projection {
 
   /**
    * @param {string} code Code.
    */
   constructor(code) {
-    Projection.call(this, {
+    super({
       code: code,
       units: Units.METERS,
       extent: EXTENT,
@@ -67,8 +64,6 @@ class EPSG3857Projection {
 
 }
 
-inherits(EPSG3857Projection, Projection);
-
 
 /**
  * Projections equal to EPSG:3857.
diff --git a/src/ol/proj/epsg4326.js b/src/ol/proj/epsg4326.js
index d626467d91..7001b8eab5 100644
--- a/src/ol/proj/epsg4326.js
+++ b/src/ol/proj/epsg4326.js
@@ -1,7 +1,6 @@
 /**
  * @module ol/proj/epsg4326
  */
-import {inherits} from '../util.js';
 import Projection from '../proj/Projection.js';
 import Units from '../proj/Units.js';
 
@@ -38,18 +37,15 @@ export const METERS_PER_UNIT = Math.PI * RADIUS / 180;
  * Note that OpenLayers does not strictly comply with the EPSG definition.
  * The EPSG registry defines 4326 as a CRS for Latitude,Longitude (y,x).
  * OpenLayers treats EPSG:4326 as a pseudo-projection, with x,y coordinates.
- *
- * @constructor
- * @extends {module:ol/proj/Projection}
  */
-class EPSG4326Projection {
+class EPSG4326Projection extends Projection {
 
   /**
    * @param {string} code Code.
    * @param {string=} opt_axisOrientation Axis orientation.
    */
   constructor(code, opt_axisOrientation) {
-    Projection.call(this, {
+    super({
       code: code,
       units: Units.DEGREES,
       extent: EXTENT,
@@ -63,8 +59,6 @@ class EPSG4326Projection {
 
 }
 
-inherits(EPSG4326Projection, Projection);
-
 
 /**
  * Projections equal to EPSG:4326.