diff --git a/src/ol/proj/chprojection.js b/src/ol/proj/chprojection.js
index 3302674635..3b485b32b4 100644
--- a/src/ol/proj/chprojection.js
+++ b/src/ol/proj/chprojection.js
@@ -410,7 +410,7 @@ goog.inherits(ol.proj.EPSG2056, ol.proj.CH);
  * @type {ol.Extent}
  */
 ol.proj.EPSG2056.EXTENT =
-    [2485869.5728, 2837076.5648, 1076443.1884, 1299941.7864];
+    [[2485869.5728, 1076443.1884], [2837076.5648, 1299941.7864]];
 
 
 /**
@@ -447,7 +447,10 @@ goog.inherits(ol.proj.EPSG21781, ol.proj.CH);
  * @const
  * @type {ol.Extent}
  */
-ol.proj.EPSG21781.EXTENT = [485869.5728, 837076.5648, 76443.1884, 299941.7864];
+ol.proj.EPSG21781.EXTENT = [
+  [485869.5728, 76443.1884],
+  [837076.5648, 299941.7864]
+];
 
 
 /**
diff --git a/src/ol/proj/epsg3857projection.js b/src/ol/proj/epsg3857projection.js
index f9b8ad3c53..8375f889b8 100644
--- a/src/ol/proj/epsg3857projection.js
+++ b/src/ol/proj/epsg3857projection.js
@@ -44,8 +44,8 @@ ol.proj.EPSG3857.HALF_SIZE = Math.PI * ol.proj.EPSG3857.RADIUS;
  * @type {ol.Extent}
  */
 ol.proj.EPSG3857.EXTENT = [
-  -ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE,
-  -ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE
+  [-ol.proj.EPSG3857.HALF_SIZE, -ol.proj.EPSG3857.HALF_SIZE],
+  [ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE]
 ];
 
 
diff --git a/src/ol/proj/epsg4326projection.js b/src/ol/proj/epsg4326projection.js
index 7257255143..4acedbede5 100644
--- a/src/ol/proj/epsg4326projection.js
+++ b/src/ol/proj/epsg4326projection.js
@@ -30,7 +30,7 @@ goog.inherits(ol.proj.EPSG4326, ol.Projection);
  * @const
  * @type {ol.Extent}
  */
-ol.proj.EPSG4326.EXTENT = [-180, 180, -90, 90];
+ol.proj.EPSG4326.EXTENT = [[-180, -90], [180, 90]];
 
 
 /**
diff --git a/test/spec/ol/proj/chprojection.test.js b/test/spec/ol/proj/chprojection.test.js
index a4a814c595..b6934a5a9c 100644
--- a/test/spec/ol/proj/chprojection.test.js
+++ b/test/spec/ol/proj/chprojection.test.js
@@ -90,8 +90,8 @@ describe('ol.proj.EPSG21781', function() {
     var fromEPSG4326 = ol.proj.getTransform('EPSG:4326', 'EPSG:21781');
     var toEPSG4326 = ol.proj.getTransform('EPSG:21781', 'EPSG:4326');
     var roundTripped, x, y;
-    for (x = extent[0]; x < extent[1]; x += 50000) {
-      for (y = extent[2]; y < extent[3]; y += 50000) {
+    for (x = extent[0][0]; x < extent[1][0]; x += 50000) {
+      for (y = extent[0][1]; y < extent[1][1]; y += 50000) {
         roundTripped = fromEPSG4326(toEPSG4326([x, y]));
         expect(roundTripped).to.be.an(Array);
         expect(roundTripped).to.have.length(2);
diff --git a/test/spec/ol/proj/proj.test.js b/test/spec/ol/proj/proj.test.js
index 4c80a78ec5..116791c831 100644
--- a/test/spec/ol/proj/proj.test.js
+++ b/test/spec/ol/proj/proj.test.js
@@ -284,7 +284,7 @@ describe('ol.proj', function() {
 
   describe('ol.proj.removeTransform()', function() {
 
-    var extent = [180, 180, -90, 90];
+    var extent = [[180, -90], [180, 90]];
     var units = ol.ProjectionUnits.DEGREES;
 
     it('removes functions cached by addTransform', function() {
@@ -347,7 +347,7 @@ describe('ol.proj', function() {
     });
 
     it('returns a configured projection', function() {
-      var extent = [485869.5728, 837076.5648, 76443.1884, 299941.7864];
+      var extent = [[485869.5728, 76443.1884], [837076.5648, 299941.7864]];
       var epsg21781 = ol.proj.configureProj4jsProjection({
         code: 'EPSG:21781',
         extent: extent