diff --git a/srcpkgs/thunderbird/template b/srcpkgs/thunderbird/template
index ef1f4e4ec2a..5999a72c17c 100644
--- a/srcpkgs/thunderbird/template
+++ b/srcpkgs/thunderbird/template
@@ -17,7 +17,7 @@ makedepends="libjpeg-turbo-devel libpng-devel>=1.6 hunspell-devel
  pixman-devel libIDL-devel nss-devel>=3.13.3 sqlite-devel libXrender-devel
  gtk+-devel libevent-devel libnotify-devel libvpx-devel GConf-devel
  startup-notification-devel dbus-glib-devel alsa-lib-devel hunspell-devel
- wireless_tools-devel libXScrnSaver-devel"
+ wireless_tools-devel libXScrnSaver-devel libSM-devel libXt-devel"
 
 do_build() {
 	cp -f ${FILESDIR}/mozconfig .mozconfig