diff --git a/pkgs/build-support/dotnet/build-dotnet-module/default.nix b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
index 4324f24eb7fb..686d89f8c11c 100644
--- a/pkgs/build-support/dotnet/build-dotnet-module/default.nix
+++ b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
@@ -172,7 +172,7 @@ stdenvNoCC.mkDerivation (args // {
 
   passthru = {
     inherit nuget-source;
-
+  } // lib.optionalAttrs (nugetDepsFile != null) {
     fetch-deps =
       let
         flags = dotnetFlags ++ dotnetRestoreFlags;