diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 9a0c93038b45..644641a4ffdf 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -221,6 +221,10 @@ in
     buildInputs = [ libffi ];
   };
 
+  fiddle = attrs: {
+    buildInputs = [ libffi ];
+  };
+
   gdk_pixbuf2 = attrs: {
     nativeBuildInputs = [ pkg-config bundler rake ]
       ++ lib.optionals stdenv.isDarwin [ DarwinTools ];