diff --git a/src/ol/render/canvas/canvas.js b/src/ol/render/canvas/canvas.js
index fdf805afb6..ca71d31e8e 100644
--- a/src/ol/render/canvas/canvas.js
+++ b/src/ol/render/canvas/canvas.js
@@ -9,6 +9,17 @@ goog.require('ol.color');
 ol.render.canvas.FillState;
 
 
+/**
+ * @typedef {{lineCap: string,
+ *            lineDash: Array.<number>,
+ *            lineJoin: string,
+ *            lineWidth: number,
+ *            miterLimit: number,
+ *            strokeStyle: string}}
+ */
+ol.render.canvas.StrokeState;
+
+
 /**
  * @const
  * @type {string}