diff --git a/pkgs/tools/networking/netboot/default.nix b/pkgs/tools/networking/netboot/default.nix
index 3a191c6ef342..a834ffc37396 100644
--- a/pkgs/tools/networking/netboot/default.nix
+++ b/pkgs/tools/networking/netboot/default.nix
@@ -9,6 +9,7 @@ let
   buildInputs = map (n: builtins.getAttr n x)
     (builtins.attrNames (builtins.removeAttrs x helperArgNames));
   sourceInfo = rec {
+    version="git-head-${rev}";
     baseName="netboot";
     rev="19a955cd87b399a5b56";
     name="${baseName}-git-head";