diff --git a/pkgs/servers/dns/knot-dns/default.nix b/pkgs/servers/dns/knot-dns/default.nix
index 3dc6fd3e2c7..6a602883b35 100644
--- a/pkgs/servers/dns/knot-dns/default.nix
+++ b/pkgs/servers/dns/knot-dns/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, gnutls, liburcu, lmdb, libcap_ng, libidn2, libunistring
-, systemd, nettle, libedit, zlib, libiconv, libintl
+, systemd, nettle, libedit, zlib, libiconv, libintl, libmaxminddb
 , autoreconfHook
 }:
 
@@ -34,6 +34,7 @@ stdenv.mkDerivation rec {
     gnutls liburcu libidn2 libunistring
     nettle libedit
     libiconv lmdb libintl
+    libmaxminddb # optional for geoip module (it's tiny)
     # without sphinx &al. for developer documentation
   ]
     ++ optionals stdenv.isLinux [ libcap_ng systemd ]