diff --git a/src/ol/typedefs.js b/src/ol/typedefs.js
index 09090ce105..88c9a8c950 100644
--- a/src/ol/typedefs.js
+++ b/src/ol/typedefs.js
@@ -646,17 +646,6 @@ ol.TileReplayState;
 ol.TileUrlFunctionType;
 
 
-/**
- * A transform function accepts an array of input coordinate values, an optional
- * output array, and an optional dimension (default should be 2).  The function
- * transforms the input coordinate values, populates the output array, and
- * returns the output array.
- *
- * @typedef {function(Array.<number>, Array.<number>=, number=): Array.<number>}
- */
-ol.TransformFunction;
-
-
 /**
  * An animation configuration
  *
diff --git a/src/ol/types.js b/src/ol/types.js
index 72fcca14dc..50eda27d03 100644
--- a/src/ol/types.js
+++ b/src/ol/types.js
@@ -57,3 +57,12 @@
  * @typedef {!Array.<number>} Transform
  */
 
+/**
+ * A transform function accepts an array of input coordinate values, an optional
+ * output array, and an optional dimension (default should be 2).  The function
+ * transforms the input coordinate values, populates the output array, and
+ * returns the output array.
+ *
+ * @typedef {function(Array.<number>, Array.<number>=, number=): Array.<number>} TransformFunction
+ * @api
+ */