diff --git a/pkgs/tools/networking/dsniff/default.nix b/pkgs/tools/networking/dsniff/default.nix
index 41acb533a3d..50a3c98af0f 100644
--- a/pkgs/tools/networking/dsniff/default.nix
+++ b/pkgs/tools/networking/dsniff/default.nix
@@ -54,7 +54,7 @@ in stdenv.mkDerivation {
 
   nativeBuildInputs = [ autoreconfHook ];
   buildInputs = [ glib pcap ];
-  NIX_CFLAGS_LINK = "-lglib-2.0";
+  NIX_CFLAGS_LINK = "-lglib-2.0 -lpthread";
   postPatch = ''
     for patch in debian/patches/*.patch; do
       patch < $patch