--- a/locales/generic/install.rdf
+++ b/locales/generic/install.rdf
@@ -10,16 +10,17 @@
 #include @APP_DEFINES@
 #endif
 
 <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:em="http://www.mozilla.org/2004/em-rdf#">
   <Description about="urn:mozilla:install-manifest"
                em:id="@INSTALL_EXTENSION_ID@"
                em:name="ChatZilla @MOZ_LANG_TITLE@ Language Pack"
+               em:internalName="langpack_cZ/@AB_CD@"
                em:version="@CHATZILLA_VERSION@"
                em:type="8"
                em:creator="@MOZ_LANGPACK_CREATOR@"
                em:homepageURL="@MOZ_LANGPACK_HOMEPAGE@">
 #ifdef MOZ_LANGPACK_CONTRIBUTORS
     @MOZ_LANGPACK_CONTRIBUTORS@
 #endif