diff --git a/openslp.service b/openslp.service
new file mode 100644
index 0000000..21a9e91
--- /dev/null
+++ b/openslp.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Service Location Protocol
+After=network.target
+
+[Service]
+Type=forking
+ExecStart=/usr/sbin/slpd -c /etc/slp/slp.conf -r /etc/slp/slp.reg -s /etc/slp/slp.spi
+ExecReload=/bin/kill -HUP $MAINPID
+
+[Install]
+WantedBy=network.target
diff --git a/openslp.spec b/openslp.spec
index 7fb854d..c9e2894 100644
--- a/openslp.spec
+++ b/openslp.spec
@@ -1,6 +1,6 @@
 Name:          openslp
 Version:       2.0.0
-Release:       2mamba
+Release:       3mamba
 Summary:       An open-source implementation of Service Location Protocol
 Group:         System/Servers
 Vendor:        openmamba
@@ -8,13 +8,13 @@ Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://www.openslp.org
 Source:        http://downloads.sourceforge.net/sourceforge/openslp/%{name}-%{version}.tar.gz
+Source1:       openslp.service
 Patch0:        %{name}-1.2.1-optflags.patch
 Patch1:        %{name}-1.2.1-export_slp_net_symbols
 Patch2:        openslp-2.0.0-openssl-1.1.patch
 License:       BSD
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: ldconfig
 BuildRequires: libe2fs-devel
 BuildRequires: libkrb5-devel
 BuildRequires: libnsl-devel
@@ -26,7 +26,6 @@ BuildRequires: flex
 BuildRequires: bison
 BuildRequires: libtool
 Requires:      libopenslp = %{?epoch:%epoch:}%{version}-%{release}
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 Service Location Protocol is an IETF standards track protocol that provides a framework to allow networking applications to discover the existence, location, and configuration of networked services in enterprise networks.
@@ -53,7 +52,7 @@ This package contains static libraries and header files needed for development.
 
 %prep
 %setup -q
-%patch2 -p1
+%patch 2 -p1
 
 %build
 %configure \
@@ -73,8 +72,7 @@ This package contains static libraries and header files needed for development.
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 %makeinstall
 
-install -D -m 755 etc/slpd.all_init \
-   %{buildroot}%{_initrddir}/slpd
+install -D -m0644 %{SOURCE1} %{buildroot}%{_unitdir}/openslp.service
 
 #rm -rf rpmdoc
 #mv %{buildroot}%{_prefix}/doc/%{name}-%{version} rpmdoc
@@ -83,16 +81,29 @@ install -D -m 755 etc/slpd.all_init \
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
+%post
+%systemd_post openslp
+:
+
+%preun
+%systemd_preun openslp
+:
+
+%postun
+%systemd_postun openslp
+:
+
 %post -n libopenslp -p /sbin/ldconfig
 %postun -n libopenslp -p /sbin/ldconfig
 
 %files
 %defattr(-,root,root)
-%config(noreplace) %{_initrddir}/slpd
+#%config(noreplace) %{_initrddir}/slpd
 %dir %{_sysconfdir}/slp
 %config(noreplace) %{_sysconfdir}/slp/slp.conf
 %config(noreplace) %{_sysconfdir}/slp/slp.reg
 %config(noreplace) %{_sysconfdir}/slp/slp.spi
+%{_unitdir}/openslp.service
 %{_bindir}/slptool
 %{_sbindir}/slpd
 
@@ -104,13 +115,15 @@ install -D -m 755 etc/slpd.all_init \
 %files -n libopenslp-devel
 %defattr(-,root,root)
 %{_libdir}/libslp.a
-%{_libdir}/libslp.la
 %{_libdir}/libslp.so
 %{_includedir}/*.h
 %doc ChangeLog FAQ NEWS README THANKS
 #%doc rpmdoc/*
 
 %changelog
+* Sat Apr 22 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.0-3mamba
+- port from sysv5 to systemd
+
 * Sun Dec 06 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.0-2mamba
 - added debug package, openssl 1.1 patch