diff --git a/tigervnc.changes b/tigervnc.changes
index 22750a4..042137b 100644
--- a/tigervnc.changes
+++ b/tigervnc.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Jul 31 13:48:16 UTC 2015 - dimstar@opensuse.org
+
+- Add /usr/sbin/groupadd and /usr/sbin/useradd Requires(post) to
+  xorg-x11-Xvnc: the scripts are creating users/groups.
+
 -------------------------------------------------------------------
 Wed Jul 15 11:52:02 UTC 2015 - msrb@suse.com
 
diff --git a/tigervnc.spec b/tigervnc.spec
index 420c3ce..74ac0d7 100644
--- a/tigervnc.spec
+++ b/tigervnc.spec
@@ -129,6 +129,8 @@ TigerVNC also provides extensions for advanced authentication methods and TLS en
 %package -n xorg-x11-Xvnc
 # Needed to generate certificates
 Requires(post): openssl
+Requires(post): /usr/sbin/useradd
+Requires(post): /usr/sbin/groupadd
 # Needed to serve java applet
 Requires:       python
 Requires:       python-pyOpenSSL
@@ -234,8 +236,8 @@ rm -rf $RPM_BUILD_ROOT/usr/share/doc/tigervnc-*
 %find_lang '%{name}'
 
 %pre -n xorg-x11-Xvnc
-getent group %{vncgroup} > /dev/null || groupadd -r %{vncgroup}
-getent passwd %{vncuser} > /dev/null || useradd -r -g %{vncgroup} -d /var/lib/empty -s /sbin/nologin -c "user for VNC" %{vncuser}
+getent group %{vncgroup} > /dev/null || groupadd -r %{vncgroup} || :
+getent passwd %{vncuser} > /dev/null || useradd -r -g %{vncgroup} -d /var/lib/empty -s /sbin/nologin -c "user for VNC" %{vncuser} || :
 
 %post -n xorg-x11-Xvnc
 if ! test -e %{tlskey} ; then