diff --git a/ci/niv-cron.nix b/ci/niv-cron.nix
index cad058ac..6a19438c 100644
--- a/ci/niv-cron.nix
+++ b/ci/niv-cron.nix
@@ -41,7 +41,7 @@ with lib; {
         ci.command {
           name = "niv-update-build";
           displayName = "niv update build";
-          environment = [ "OPENSSH_PRIVATE_KEY" "CACHIX_SIGNING_KEY" ];
+          environment = [ "OPENSSH_PRIVATE_KEY" "CACHIX_SIGNING_KEY" "GITHUB_REF" ];
           command = ''
             if [[ -n $OPENSSH_PRIVATE_KEY ]]; then
               mkdir ~/.ssh
@@ -73,9 +73,9 @@ with lib; {
               if nix build -Lf . hosts.{athame,yule,samhain}.config.system.build.toplevel; then
                 if [[ -n $CACHIX_SIGNING_KEY ]]; then
                   nix build --no-link -Lf . sourceCache.all
-                  cachix push kittywitch $(nix eval -f . sourceCache.allStr)
+                  cachix push kittywitch $(nix eval --raw -f . sourceCache.allStr)
 
-                  cachix push kittywitch $(readlink result*/) &
+                  cachix push kittywitch result*/ &
                   CACHIX_PUSH=$!
                 fi
                 if [[ -n $OPENSSH_PRIVATE_KEY ]]; then