diff --git a/docker.nix b/docker.nix
index 25930bb87..bfccdb8f5 100644
--- a/docker.nix
+++ b/docker.nix
@@ -232,6 +232,9 @@ pkgs.dockerTools.buildLayeredImageWithNixDb {
     rm -rf nix-support
     ln -s /nix/var/nix/profiles nix/var/nix/gcroots/profiles
   '';
+  fakeRootCommands = ''
+    chmod 1777 tmp
+  '';
 
   config = {
     Cmd = [ "/root/.nix-profile/bin/bash" ];