diff --git a/srcpkgs/firefox/template b/srcpkgs/firefox/template
index 44b74e3b4ec..dcfba4ddfdb 100644
--- a/srcpkgs/firefox/template
+++ b/srcpkgs/firefox/template
@@ -12,7 +12,7 @@ checksum=f468a65a24524b64ebd1e697eb08908d4a4b6fa39055bbbb92df5dcf8d2329ba
 
 lib32disabled=yes
 
-hostmakedepends="unzip zip pkg-config perl python yasm"
+hostmakedepends="unzip zip pkg-config perl python yasm libXt-devel"
 makedepends="nss-devel>=3.17 libjpeg-turbo-devel libpng-devel>=1.6
  icu-devel>=54 pixman-devel sqlite-devel gst-plugins-base1-devel gtk+-devel
  libevent-devel libnotify-devel libvpx-devel>1.3.0 libXrender-devel