diff --git a/pkgs/applications/networking/cluster/nixops/plugins/nixos-modules-contrib.nix b/pkgs/applications/networking/cluster/nixops/plugins/nixos-modules-contrib.nix
index 5c6e9fec32cf..494208d347f0 100644
--- a/pkgs/applications/networking/cluster/nixops/plugins/nixos-modules-contrib.nix
+++ b/pkgs/applications/networking/cluster/nixops/plugins/nixos-modules-contrib.nix
@@ -8,7 +8,7 @@
 
 buildPythonPackage {
   pname = "nixos-modules-contrib";
-  version = "unstable-2021-01-20";
+  version = "0-unstable-2021-01-20";
   pyproject = true;
 
   src = fetchFromGitHub {