diff --git a/changelog.html b/changelog.html
index dafae31c97213cc7db476bf7c8f7893a49f64322..375eeeee5627a64775d8c32a4aa19e42b9c41955 100644
--- a/changelog.html
+++ b/changelog.html
@@ -55,6 +55,8 @@ Upcoming changes</a>
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
+  <li class=bug>
+    Since 1.494, when signing up as a new user in the private security realm the email address was left unconfigured and a stack trace printed.
   <li class=rfe>
     Display authorities at <code>/user/*</code> for convenience.
     (<a href="https://github.com/jenkinsci/jenkins/pull/577">pull 577</a>)
diff --git a/core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java b/core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java
index cb1ce711e7b247f487be954000ea8af36e75ab12..a774fd435dfd2fb37c05ac5dc8911863575faa52 100644
--- a/core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java
+++ b/core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java
@@ -330,7 +330,7 @@ public class HudsonPrivateSecurityRealm extends AbstractPasswordBasedSecurityRea
         user.setFullName(si.fullname);
         try {
             // legacy hack. mail support has moved out to a separate plugin
-            Class<?> up = Jenkins.getInstance().pluginManager.uberClassLoader.loadClass("hudson.tasks.Mailer.UserProperty");
+            Class<?> up = Jenkins.getInstance().pluginManager.uberClassLoader.loadClass("hudson.tasks.Mailer$UserProperty");
             Constructor<?> c = up.getDeclaredConstructor(String.class);
             user.addProperty((UserProperty)c.newInstance(si.email));
         } catch (RuntimeException e) {