diff --git a/pkgs/servers/sql/postgresql/ext/pgroonga.nix b/pkgs/servers/sql/postgresql/ext/pgroonga.nix
index bb0f33490b7e..78dd305c98d6 100644
--- a/pkgs/servers/sql/postgresql/ext/pgroonga.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgroonga.nix
@@ -10,7 +10,17 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ postgresql msgpack-c groonga ];
+  buildInputs =
+    let
+      groonga-with-msgpack = groonga.overrideAttrs (oa: {
+        buildInputs = oa.buildInputs ++ [ msgpack-c ];
+      });
+    in
+    [
+      postgresql
+      msgpack-c
+      groonga-with-msgpack
+    ];
 
   makeFlags = [
     "HAVE_MSGPACK=1"