diff --git a/pkgs/tools/networking/libreswan/default.nix b/pkgs/tools/networking/libreswan/default.nix
index 25ad29b1cfe7..01ac1af23ef0 100644
--- a/pkgs/tools/networking/libreswan/default.nix
+++ b/pkgs/tools/networking/libreswan/default.nix
@@ -11,6 +11,7 @@
 , pam
 , libevent
 , libcap_ng
+, libxcrypt
 , curl
 , nspr
 , bash
@@ -66,7 +67,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     systemd coreutils
     gnused gawk gmp unbound pam libevent
-    libcap_ng curl nspr nss ldns
+    libcap_ng libxcrypt curl nspr nss ldns
     # needed to patch shebangs
     python3 bash
   ] ++ lib.optional stdenv.isLinux libselinux;