diff --git a/swtpm.changes b/swtpm.changes
index 0a8dadf..09553d2 100644
--- a/swtpm.changes
+++ b/swtpm.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Dec 22 07:53:04 UTC 2020 - Gary Ching-Pang Lin <glin@suse.com>
+
+- Use "Requires user(tss)" for the "tss" user and group
+
 -------------------------------------------------------------------
 Tue Dec 22 04:06:10 UTC 2020 - Gary Ching-Pang Lin <glin@suse.com>
 
diff --git a/swtpm.spec b/swtpm.spec
index 1acf328..7f7efe6 100644
--- a/swtpm.spec
+++ b/swtpm.spec
@@ -45,6 +45,7 @@ BuildRequires:  socat
 Requires:       iproute2
 Requires:       python3-cryptography
 Requires:       trousers
+Requires:       user(tss)
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
@@ -89,15 +90,7 @@ make %{?_smp_mflags}
 
 mkdir -p %{buildroot}%{_localstatedir}/lib/swtpm-localca
 
-%post
-/sbin/ldconfig
-
-# the same user/group is employed by trousers
-/usr/bin/getent group tss >/dev/null || /usr/sbin/groupadd -g 98 tss
-/usr/bin/getent passwd tss >/dev/null || \
-        /usr/sbin/useradd -u 98 -o -g tss -s /bin/false -c "TSS daemon" \
-        -d /var/lib/tpm tss
-
+%post -p /sbin/ldconfig
 %postun -p /sbin/ldconfig
 
 %files