diff --git a/plasma5-workspace.changes b/plasma5-workspace.changes
index cb583b6..11e8c7b 100644
--- a/plasma5-workspace.changes
+++ b/plasma5-workspace.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Oct 23 19:12:41 UTC 2015 - hrvoje.senjan@gmail.com
+
+- Make sure users have pam_unix module in place so the screenlocker
+  works when upgrading from openSUSE < 12.3 (boo#931296)
+
 -------------------------------------------------------------------
 Wed Oct 21 18:58:15 UTC 2015 - hrvoje.senjan@gmail.com
 
diff --git a/plasma5-workspace.spec b/plasma5-workspace.spec
index 290d1b9..95ff959 100644
--- a/plasma5-workspace.spec
+++ b/plasma5-workspace.spec
@@ -77,6 +77,7 @@ BuildRequires:  wayland-devel >= 1.2.1
 %else
 BuildRequires:  wayland-devel >= 1.3.0
 %endif
+BuildRequires:  pam-config
 BuildRequires:  xz
 BuildRequires:  pkgconfig(Qt5Concurrent) >= 5.4.0
 BuildRequires:  pkgconfig(Qt5DBus) >= 5.4.0
@@ -98,6 +99,7 @@ BuildRequires:  pkgconfig(xcursor)
 BuildRequires:  pkgconfig(xi)
 BuildRequires:  pkgconfig(xrender)
 BuildRequires:  pkgconfig(zlib)
+Requires(post): pam-config
 Conflicts:      kdebase4-workspace < 5.3.0
 # Some files have been moved from kio-extras5 to plasma5-workspace in 5.4. This should prevent a possible file conflict. (boo#944656)
 Conflicts:      kio-extras5 < 15.08.0
@@ -215,7 +217,11 @@ workspace. Development files.
   # we have a separate package for Plasma5 session
   rm -rfv %{buildroot}%{_kf5_sharedir}/xsessions
 
-%post -p /sbin/ldconfig
+%post
+# boo#931296
+/usr/sbin/pam-config -d --unix2 || :
+/usr/sbin/pam-config -a --unix || :
+/sbin/ldconfig
 
 %postun -p /sbin/ldconfig