diff --git a/pkgs/build-support/dotnet/build-dotnet-module/default.nix b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
index 1a5d499929ac..5ccff2f2a198 100644
--- a/pkgs/build-support/dotnet/build-dotnet-module/default.nix
+++ b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
@@ -145,7 +145,7 @@ in stdenvNoCC.mkDerivation (args // {
 
       store_src="${srcOnly args}"
       src="$(mktemp -d /tmp/${pname}.XXX)"
-      cp -rT "$store_src" "$src"
+      cp -r "$store_src/." "$src"
       chmod -R +w "$src"
 
       trap "rm -rf $src $HOME" EXIT