diff --git a/src/ol/source/imagewmssource.exports b/src/ol/source/imagewmssource.exports
index afd33970c9..acb2495587 100644
--- a/src/ol/source/imagewmssource.exports
+++ b/src/ol/source/imagewmssource.exports
@@ -1,3 +1,4 @@
 @exportSymbol ol.source.ImageWMS
 @exportProperty ol.source.ImageWMS.prototype.getParams
+@exportProperty ol.source.ImageWMS.prototype.setUrl
 @exportProperty ol.source.ImageWMS.prototype.updateParams
diff --git a/src/ol/source/imagewmssource.js b/src/ol/source/imagewmssource.js
index 72b591e09a..6fd03abeb6 100644
--- a/src/ol/source/imagewmssource.js
+++ b/src/ol/source/imagewmssource.js
@@ -185,6 +185,18 @@ ol.source.ImageWMS.prototype.getImage =
 };
 
 
+/**
+ * @param {string|undefined} url URL.
+ */
+ol.source.ImageWMS.prototype.setUrl = function(url) {
+  if (url != this.url_) {
+    this.url_ = url;
+    this.image_ = null;
+    this.dispatchChangeEvent();
+  }
+};
+
+
 /**
  * Update the user-provided params.
  * @param {Object} params Params.