diff --git a/pkgs/servers/irc/atheme/default.nix b/pkgs/servers/irc/atheme/default.nix
index 9db7ef3aaca8..3df18bbe0c97 100644
--- a/pkgs/servers/irc/atheme/default.nix
+++ b/pkgs/servers/irc/atheme/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchgit, libmowgli, pkg-config, git, gettext, pcre, libidn, cracklib, openssl }:
+{ lib, stdenv, fetchgit, libmowgli, pkg-config, git, gettext, pcre, libidn, libxcrypt, cracklib, openssl }:
 
 stdenv.mkDerivation rec {
   pname = "atheme";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkg-config git gettext ];
-  buildInputs = [ libmowgli pcre libidn cracklib openssl ];
+  buildInputs = [ libmowgli pcre libidn libxcrypt cracklib openssl ];
 
   configureFlags = [
     "--with-pcre"