diff --git a/src/main/java/org/dynmap/ClientConfigurationComponent.java b/src/main/java/org/dynmap/ClientConfigurationComponent.java
index 51f3f9f7..8e93fcd6 100644
--- a/src/main/java/org/dynmap/ClientConfigurationComponent.java
+++ b/src/main/java/org/dynmap/ClientConfigurationComponent.java
@@ -21,6 +21,7 @@ public class ClientConfigurationComponent extends Component {
                 s(t, "webprefix", unescapeString(c.getString("webprefix", "[WEB] ")));
                 s(t, "defaultzoom", c.getInteger("defaultzoom", 0));
                 s(t, "sidebaropened", c.getString("sidebaropened", "false"));
+                s(t, "dynmapversion", plugin.getDescription().getVersion());
                 
                 DynmapWorld defaultWorld = null;
                 String defmap = null;
diff --git a/web/js/map.js b/web/js/map.js
index 60d35a2e..e1342f01 100644
--- a/web/js/map.js
+++ b/web/js/map.js
@@ -1,6 +1,7 @@
 "use strict";
 //if (!console) console = { log: function() {} }; 
 
+var dynmapversion = "0.22";	// This needs to match plugin verison
 var componentconstructors = {};
 var maptypes = {};
 var map = null;	// Leaflet assumes top-level 'map'...
@@ -286,6 +287,12 @@ DynMap.prototype = {
 			.addClass('alertbox')
 			.hide()
 			.appendTo(container);
+
+		if(dynmapversion != me.options.dynmapversion) {
+			me.alertbox
+				.text('Web files are not matched with plugin version: All files need to be same version (' + me.options.dynmapverion + ')')
+				.show();
+		}
 		
 		me.selectMap(me.defaultworld.defaultmap);