diff --git a/pkgs/servers/search/sphinxsearch/default.nix b/pkgs/servers/search/sphinxsearch/default.nix
index 33725697d799..0b34c1f44a8f 100644
--- a/pkgs/servers/search/sphinxsearch/default.nix
+++ b/pkgs/servers/search/sphinxsearch/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
     expat
   ];
 
-  CXXFLAGS = with lib; concatStringsSep " " (optionals stdenv.isDarwin [
+  CXXFLAGS = lib.concatStringsSep " " (lib.optionals stdenv.isDarwin [
     # see upstream bug: http://sphinxsearch.com/bugs/view.php?id=2578
     # workaround for "error: invalid suffix on literal
     "-Wno-reserved-user-defined-literal"