diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 97715659be0d..232efeb42571 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -21,7 +21,7 @@
 , libiconv, postgresql, v8, clang, sqlite, zlib, imagemagick, lasem
 , pkg-config , ncurses, xapian, gpgme, util-linux, tzdata, icu, libffi
 , cmake, libssh2, openssl, openssl_1_1, libmysqlclient, git, perl, pcre, pcre2, gecode_3, curl
-, msgpack, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, gtk3, buildRubyGem
+, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, gtk3, buildRubyGem
 , cairo, expat, re2, rake, gobject-introspection, gdk-pixbuf, zeromq, czmq, graphicsmagick, libcxx
 , file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf, fribidi, harfbuzz
 , bison, flex, pango, python3, patchelf, binutils, freetds, wrapGAppsHook, atk
@@ -562,10 +562,6 @@ in
     '';
   };
 
-  msgpack = attrs: {
-    buildInputs = [ msgpack ];
-  };
-
   mysql = attrs: {
     buildInputs = [ libmysqlclient zlib openssl ];
   };