diff --git a/pkgs/tools/networking/ppp/default.nix b/pkgs/tools/networking/ppp/default.nix
index 6f6f2a0da55..8f1cf29e519 100644
--- a/pkgs/tools/networking/ppp/default.nix
+++ b/pkgs/tools/networking/ppp/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     [ ( substituteAll {
         src = ./nix-purity.patch;
         inherit libpcap;
-        glibc = stdenv.gcc.libc;
+        glibc = stdenv.gcc.libc.dev;
       })
       ./nonpriv.patch
     ];