diff --git a/gammu.spec b/gammu.spec
index e2eef00..640c203 100644
--- a/gammu.spec
+++ b/gammu.spec
@@ -35,9 +35,7 @@ BuildRequires:  glib2-devel
 BuildREquires:  libgudev1-devel
 BuildRequires:  bash-completion
 
-Requires(post): systemd-units
-Requires(preun): systemd-units
-Requires(postun): systemd-units
+%{?systemd_requires}
 BuildRequires: systemd
 
 Requires:       bluez, dialog