diff --git a/src/ol/source/wmssource.exports b/src/ol/source/wmssource.exports
new file mode 100644
index 0000000000..b5669e8ec7
--- /dev/null
+++ b/src/ol/source/wmssource.exports
@@ -0,0 +1,4 @@
+@exportSymbol ol.source.wms.ServerType
+@exportProperty ol.source.wms.ServerType.GEOSERVER
+@exportProperty ol.source.wms.ServerType.MAPSERVER
+@exportProperty ol.source.wms.ServerType.QGIS
diff --git a/src/ol/source/wmssource.js b/src/ol/source/wmssource.js
index c9711b0946..6dde4c7663 100644
--- a/src/ol/source/wmssource.js
+++ b/src/ol/source/wmssource.js
@@ -10,8 +10,8 @@ goog.require('goog.uri.utils');
  * @enum {string}
  */
 ol.source.wms.ServerType = {
-  MAPSERVER: 'mapserver',
   GEOSERVER: 'geoserver',
+  MAPSERVER: 'mapserver',
   QGIS: 'qgis'
 };