diff --git a/watchdog.spec b/watchdog.spec
index b48ebd0..3aba5e3 100644
--- a/watchdog.spec
+++ b/watchdog.spec
@@ -16,6 +16,8 @@ Source4:          watchdog.service
 Patch1:           0001-watchdog-Clearer-help-output.patch
 Patch2:           0002-wd_identify-wd_keepalive-Document-c-config-file-in-h.patch
 
+BuildRequires:    systemd-units
+
 Requires(post): systemd-units
 Requires(preun): systemd-units
 Requires(postun): systemd-units
@@ -115,6 +117,7 @@ fi
 * Tue Jul 30 2013 Richard W.M. Jones <rjones@redhat.com> - 5.13-2
 - Enable /etc/watchdog.d directory for storing test binaries
   (RHBZ#657750, RHBZ#831190).
+- Missing BR systemd-units.
 - Update .gitignore.
 - Drop Group line, not required by modern RPM.