diff --git a/thunderbird.desktop b/thunderbird.desktop
index da9c844..a49820c 100644
--- a/thunderbird.desktop
+++ b/thunderbird.desktop
@@ -11,3 +11,4 @@ Type=Application
 StartupWMClass=Thunderbird-bin
 MimeType=message/rfc822;x-scheme-handler/mailto;
 StartupNotify=true
+Categories=Network;Email;
diff --git a/thunderbird.spec b/thunderbird.spec
index d0672ed..9eeb38a 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -264,8 +264,6 @@ cd -
 
 desktop-file-install --vendor mozilla \
   --dir $RPM_BUILD_ROOT%{_datadir}/applications \
-  --add-category Network \
-  --add-category Email \
   %{SOURCE20}