diff --git a/pkgs/development/python-modules/protobuf/default.nix b/pkgs/development/python-modules/protobuf/default.nix
index 68177357ca6d..8df8bb7c4a7d 100644
--- a/pkgs/development/python-modules/protobuf/default.nix
+++ b/pkgs/development/python-modules/protobuf/default.nix
@@ -41,8 +41,6 @@ buildPythonPackage {
     fi
   '';
 
-  outputs = [ "out" "dev" ];
-
   buildInputs = [ protobuf ];
 
   propagatedNativeBuildInputs = [