diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c02c5c65999..477df47003d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2744,7 +2744,7 @@ in
     mozc = callPackage ../tools/inputmethods/fcitx-engines/fcitx-mozc rec {
       python = python2;
       inherit (python2Packages) gyp;
-      protobuf = pkgs.protobuf.overrideDerivation (oldAttrs: { stdenv = clangStdenv; });
+      protobuf = pkgs.protobuf3_6.overrideDerivation (oldAttrs: { stdenv = clangStdenv; });
     };
 
     table-extra = callPackage ../tools/inputmethods/fcitx-engines/fcitx-table-extra { };