diff --git a/distro-source/windows/build.xml b/distro-source/windows/build.xml
index fbbb31f..8373039 100755
--- a/distro-source/windows/build.xml
+++ b/distro-source/windows/build.xml
@@ -9,7 +9,7 @@
     <zip destfile="${project.dist}">
       <!-- jars -->
       <zipfileset file="${gwt.build.lib}/gwt-dev-${dist.platform}.jar" prefix="${project.distname}" />
-      <tarfileset file="${gwt.build.lib}/gwt-dev-oophm.jar" prefix="${project.distname}" />
+      <zipfileset file="${gwt.build.lib}/gwt-dev-oophm.jar" prefix="${project.distname}" />
       <zipfileset file="${gwt.build.lib}/gwt-user.jar" prefix="${project.distname}" />
       <zipfileset file="${gwt.build.lib}/gwt-servlet.jar" prefix="${project.distname}" />
       <zipfileset file="${gwt.build.lib}/gwt-benchmark-viewer.jar" prefix="${project.distname}" />