diff --git a/modules/k8s.nix b/modules/k8s.nix
index 2da2e9a..9783630 100644
--- a/modules/k8s.nix
+++ b/modules/k8s.nix
@@ -134,8 +134,8 @@ let
           else
             dest=\$1
           fi
-          [ -e $dest.bak ] && rm -rf $dest.bak
-          [ -e $dest ] && mv $dest $dest.bak
+          [ -e \$dest.bak ] && rm -rf \$dest.bak
+          [ -e \$dest ] && mv \$dest \$dest.bak
           echo "Copying charts into \$dest"
           cp -r ${kubernetes-charts}/share/kubernetes-charts \$dest
           chown -R \$USER \$dest