diff --git a/build-ivy.xml b/build-ivy.xml
index bf2625c..3fc6ca8 100644
--- a/build-ivy.xml
+++ b/build-ivy.xml
@@ -48,6 +48,15 @@
       <keep name="com.threerings.getdown.launcher.GetdownApp">
         <method access="static" name="main"/>
       </keep>
+      <keep name="com.threerings.getdown.tools.Differ">
+        <method access="static" name="main"/>
+      </keep>
+      <keep name="com.threerings.getdown.tools.Patcher">
+        <method access="static" name="main"/>
+      </keep>
+      <keep name="com.threerings.getdown.tools.AppletParamSigner">
+        <method access="static" name="main"/>
+      </keep>
       <keep name="com.threerings.getdown.launcher.GetdownApplet">
         <constructor/><method name="*"/><field access="public" name="*"/>
       </keep>