diff --git a/pkgs/development/libraries/openldap/default.nix b/pkgs/development/libraries/openldap/default.nix
index 7155d0f48a80..94a4db43fda6 100644
--- a/pkgs/development/libraries/openldap/default.nix
+++ b/pkgs/development/libraries/openldap/default.nix
@@ -20,6 +20,7 @@ stdenv.mkDerivation rec {
       "--disable-dependency-tracking"   # speeds up one-time build
       "--enable-modules"
       "--sysconfdir=/etc"
+      "--enable-crypt"
     ] ++ stdenv.lib.optional (openssl == null) "--without-tls"
       ++ stdenv.lib.optional (cyrus_sasl == null) "--without-cyrus-sasl"
       ++ stdenv.lib.optional stdenv.isFreeBSD "--with-pic";