diff --git a/changelog/upgrade-notes.md b/changelog/upgrade-notes.md
index cf244eef3c..5aa98e915e 100644
--- a/changelog/upgrade-notes.md
+++ b/changelog/upgrade-notes.md
@@ -12,6 +12,7 @@ A number of internal types have been renamed.  This will not affect those who us
  * rename `ol.style.IconOrigin` to `ol.style.Icon.Origin`
  * rename `ol.format.IGCZ` to `ol.format.IGC.Z`
  * rename `ol.layer.GroupProperty` to `ol.layer.Group.Property`
+ * rename `ol.CollectionProperty` to `ol.Collection.Property`
 
 ### v3.18.0
 
diff --git a/src/ol/collection.js b/src/ol/collection.js
index 27de4deb00..6132df8ab8 100644
--- a/src/ol/collection.js
+++ b/src/ol/collection.js
@@ -10,14 +10,6 @@ goog.require('ol.events.Event');
 goog.require('ol.Object');
 
 
-/**
- * @enum {string}
- */
-ol.CollectionProperty = {
-  LENGTH: 'length'
-};
-
-
 /**
  * @classdesc
  * An expanded version of standard JS Array, adding convenience methods for
@@ -121,7 +113,7 @@ ol.Collection.prototype.item = function(index) {
  * @api stable
  */
 ol.Collection.prototype.getLength = function() {
-  return /** @type {number} */ (this.get(ol.CollectionProperty.LENGTH));
+  return /** @type {number} */ (this.get(ol.Collection.Property.LENGTH));
 };
 
 
@@ -227,7 +219,15 @@ ol.Collection.prototype.setAt = function(index, elem) {
  * @private
  */
 ol.Collection.prototype.updateLength_ = function() {
-  this.set(ol.CollectionProperty.LENGTH, this.array_.length);
+  this.set(ol.Collection.Property.LENGTH, this.array_.length);
+};
+
+
+/**
+ * @enum {string}
+ */
+ol.Collection.Property = {
+  LENGTH: 'length'
 };