1 files changed, 5 insertions, 3 deletions
diff --git a/pkgs/development/libraries/nanopb/test-simple-proto3/default.nix b/pkgs/development/libraries/nanopb/test-simple-proto3/default.nix
index 71507054458fe..d92698d21ece5 100644
--- a/pkgs/development/libraries/nanopb/test-simple-proto3/default.nix
+++ b/pkgs/development/libraries/nanopb/test-simple-proto3/default.nix
@@ -1,10 +1,12 @@
-{ stdenv, protobuf, nanopb }:
+{ lib, stdenv, protobuf, nanopb }:
 
 stdenv.mkDerivation {
   name = "nanopb-test-simple-proto3";
   meta.timeout = 60;
-  src = ./.;
-
+  src = lib.fileset.toSource {
+    root = ./.;
+    fileset = lib.fileset.unions [ ./simple.proto ];
+  };
   # protoc requires any .proto file to be compiled to reside within it's
   # proto_path. By default the current directory is automatically added to the
   # proto_path. I tried using --proto_path ${./.} ${./simple.proto} and it did