diff --git a/debian/control b/debian/control
index ed92791..0d9cab7 100644
--- a/debian/control
+++ b/debian/control
@@ -6,6 +6,7 @@ Standards-Version: 4.7.2.0
 Rules-Requires-Root: no
 Build-Depends: debhelper-compat (= 13), gettext, pkgconf,
  bash-completion,
+ libcrypt-dev,
  libidn2-dev,
 Vcs-Git: https://github.com/rfc1036/whois.git
 Vcs-Browser: https://github.com/rfc1036/whois