diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3ccef4ab8b5a..4d5abc3e0846 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1427,6 +1427,7 @@ in
 
     mozc = callPackage ../tools/inputmethods/fcitx-engines/fcitx-mozc {
       inherit (pythonPackages) gyp;
+      protobuf = protobuf.override { stdenv = clangStdenv; };
     };
 
     table-other = callPackage ../tools/inputmethods/fcitx-engines/fcitx-table-other { };