diff --git a/release.nix b/release.nix
index be8831d06de..b0e3036942c 100644
--- a/release.nix
+++ b/release.nix
@@ -79,7 +79,8 @@ let
             inherit nixpkgs;
             modules = [ ];
           }).options;
-        revision = if rev == 1234 then "HEAD" else toString rev;
+        revision = with nixosSrc;
+          if rev == 1234 then "HEAD" else toString rev;
       };