diff --git a/pkgs/build-support/fetchgithub/default.nix b/pkgs/build-support/fetchgithub/default.nix
index a08f6d5de12b6..288a10b95a4b9 100644
--- a/pkgs/build-support/fetchgithub/default.nix
+++ b/pkgs/build-support/fetchgithub/default.nix
@@ -15,6 +15,7 @@ let
     fetchLFS = false;
     forceFetchGit = false;
     leaveDotGit = null;
+    postCheckout = "";
     rootDir = "";
     sparseCheckout = null;
   };