diff --git a/arpwatch.spec b/arpwatch.spec
index 9ad0e82..e3316fc 100644
--- a/arpwatch.spec
+++ b/arpwatch.spec
@@ -24,6 +24,8 @@ SourceLicense:  %{shrink:
                 }
 URL:            https://ee.lbl.gov/
 
+Requires(pre):  shadow-utils
+
 Requires:       /usr/sbin/sendmail
 Requires:       python3
 
@@ -48,7 +50,7 @@ Source0:        https://ee.lbl.gov/downloads/arpwatch/arpwatch-%{version}.tar.gz
 # updated), we store the file directly in the repository with the spec file;
 # see the update-oui-csv script.
 #
-# File oui.csv last fetched 2025-12-11T07:07:44+00:00.
+# File oui.csv last fetched 2025-12-11T07:07:57+00:00.
 Source1:        oui.csv
 Source2:        arpwatch.service
 Source3:        arpwatch.sysconfig
@@ -214,6 +216,10 @@ fi
 %systemd_post arpwatch.service
 
 
+%pre
+%sysusers_create_compat %{SOURCE6}
+
+
 %postun
 %systemd_postun_with_restart arpwatch.service