diff --git a/plugin/plugin.jelly b/plugin/plugin.jelly
index 245091ef..5ea779a6 100644
--- a/plugin/plugin.jelly
+++ b/plugin/plugin.jelly
@@ -32,14 +32,17 @@
 
   <define:taglib uri="plugin">
 
-    <define:jellybean
-        name="validate-xml"
-        className="org.apache.maven.JaxpMsvBean"
-        method="validate">
-        <!-- @schema : The schema to validate against (full path) -->
-        <!-- @file : The file to be validated (full path) -->
-    </define:jellybean>
-
+    <!-- We can't use it in the bootstrap phase because classes aren't yet build for the plugin -->
+    <j:if test="${bootstrapping == null}">
+      <define:jellybean
+          name="validate-xml"
+          className="org.apache.maven.JaxpMsvBean"
+          method="validate">
+          <!-- @schema : The schema to validate against (full path) -->
+          <!-- @file : The file to be validated (full path) -->
+      </define:jellybean>
+    </j:if>
+    
     <define:tag name="uninstall">
       <ant:delete verbose="false" failonerror="false">
         <ant:fileset dir="${maven.plugin.dir}">