diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 58831d2cc4e..3c355d08576 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -354,6 +354,10 @@ in
     buildInputs = [ kerberos ];
   };
 
+  tiny_tds = attrs: {
+    nativeBuildInputs = [ pkgconfig openssl ];
+  };
+
   therubyracer = attrs: {
     buildFlags = [
       "--with-v8-dir=${v8}"