diff --git a/src/ol/source/imagewmssource.js b/src/ol/source/imagewmssource.js
index 2f417a7193..b5bf1f9695 100644
--- a/src/ol/source/imagewmssource.js
+++ b/src/ol/source/imagewmssource.js
@@ -117,7 +117,7 @@ ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_ = [101, 101];
  * constructed.
  * @param {ol.Coordinate} coordinate Coordinate.
  * @param {number} resolution Resolution.
- * @param {ol.proj.Projection} projection Projection.
+ * @param {ol.proj.ProjectionLike} projection Projection.
  * @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
  *     be provided. If `QUERY_LAYERS` is not provided then the layers specified
  *     in the `LAYERS` parameter will be used. `VERSION` should not be
@@ -155,7 +155,7 @@ ol.source.ImageWMS.prototype.getGetFeatureInfoUrl =
 
   return this.getRequestUrl_(
       extent, ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_,
-      1, projection, baseParams);
+      1, ol.proj.get(projection), baseParams);
 };