diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 26925de8db42..b889ae60d639 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -164,6 +164,10 @@ in
       '';
     } else {};
 
+  sequel_pg = attrs: {
+    buildInputs = [ postgresql ];
+  };
+
   snappy = attrs: {
     buildInputs = [ args.snappy ];
   };