diff --git a/src/ol/reproj/Triangulation.js b/src/ol/reproj/Triangulation.js
index 3e41359e13..bcb6e4d121 100644
--- a/src/ol/reproj/Triangulation.js
+++ b/src/ol/reproj/Triangulation.js
@@ -7,6 +7,14 @@ import {modulo} from '../math.js';
 import {getTransform} from '../proj.js';
 
 
+/**
+ * Single triangle; consists of 3 source points and 3 target points.
+ * @typedef {Object} Triangle
+ * @property {Array.<module:ol/coordinate~Coordinate>} source
+ * @property {Array.<module:ol/coordinate~Coordinate>} target
+ */
+
+
 /**
  * Maximum number of subdivision steps during raster reprojection triangulation.
  * Prevents high memory usage and large number of proj4 calls (for certain
@@ -85,7 +93,7 @@ const Triangulation = function(sourceProj, targetProj, targetExtent,
   this.errorThresholdSquared_ = errorThreshold * errorThreshold;
 
   /**
-   * @type {Array.<ol.ReprojTriangle>}
+   * @type {Array.<module:ol/reproj/Triangulation~Triangle>}
    * @private
    */
   this.triangles_ = [];
@@ -340,7 +348,7 @@ Triangulation.prototype.calculateSourceExtent = function() {
 
 
 /**
- * @return {Array.<ol.ReprojTriangle>} Array of the calculated triangles.
+ * @return {Array.<module:ol/reproj/Triangulation~Triangle>} Array of the calculated triangles.
  */
 Triangulation.prototype.getTriangles = function() {
   return this.triangles_;
diff --git a/src/ol/typedefs.js b/src/ol/typedefs.js
index c4003291a1..c310d79f04 100644
--- a/src/ol/typedefs.js
+++ b/src/ol/typedefs.js
@@ -181,15 +181,6 @@ ol.RasterOperation;
 ol.RegularShapeRenderOptions;
 
 
-/**
- * Single triangle; consists of 3 source points and 3 target points.
- *
- * @typedef {{source: Array.<module:ol/coordinate~Coordinate>,
- *            target: Array.<module:ol/coordinate~Coordinate>}}
- */
-ol.ReprojTriangle;
-
-
 /**
  * Number of features; bounds/extent.
  * @typedef {{numberOfFeatures: number,