diff --git a/pkgs/applications/networking/browsers/firefox-bin/update.nix b/pkgs/applications/networking/browsers/firefox-bin/update.nix
index 03815a70332..6a95a9baebb 100644
--- a/pkgs/applications/networking/browsers/firefox-bin/update.nix
+++ b/pkgs/applications/networking/browsers/firefox-bin/update.nix
@@ -23,6 +23,7 @@ in writeScript "update-${name}" ''
   set -eux
   pushd ${basePath}
 
+  HOME=`mktemp -d`
   export GNUPGHOME=`mktemp -d`
   gpg --keyserver hkps://gpg.mozilla.org --recv-keys 14F26682D0916CDD81E37B6D61B7B526D98F0353