diff --git a/src/ol/typedefs.js b/src/ol/typedefs.js
index aded1fed4e..09090ce105 100644
--- a/src/ol/typedefs.js
+++ b/src/ol/typedefs.js
@@ -475,13 +475,6 @@ ol.RotationConstraintType;
 ol.SelectFilterFunction;
 
 
-/**
- * An array of numbers representing a size: `[width, height]`.
- * @typedef {Array.<number>}
- */
-ol.Size;
-
-
 /**
  * @typedef {{
  *     snapped: {boolean},
diff --git a/src/ol/types.js b/src/ol/types.js
index 4c52ed22a9..72fcca14dc 100644
--- a/src/ol/types.js
+++ b/src/ol/types.js
@@ -45,6 +45,12 @@
  * @api
  */
 
+/**
+ * An array of numbers representing a size: `[width, height]`.
+ * @typedef {Array.<number>} Size
+ * @api
+ */
+
 /**
  * An array representing an affine 2d transformation for use with
  * {@link module:ol/transform} functions. The array has 6 elements.