diff --git a/pkgs/os-specific/linux/libnl/v2.nix b/pkgs/os-specific/linux/libnl/v2.nix
index cbe938d2ee41..cb5c022c3d4c 100644
--- a/pkgs/os-specific/linux/libnl/v2.nix
+++ b/pkgs/os-specific/linux/libnl/v2.nix
@@ -9,7 +9,6 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ bison flex ];
-  postConfigure = "type -tp flex";
 
   meta = {
     homepage = "http://www.infradead.org/~tgr/libnl/";