diff --git a/debian/postinst b/debian/postinst
index c0b3d7a..13083c0 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -17,7 +17,7 @@ while true; do
 		then
 			if [ -f /etc/pam.d/common-session ]
 			then
-
+				cp /etc/pam.d/common-session /etc/pam.d/common-session.orig
 				sed -i '/pam_script.so/d' /etc/pam.d/common-session
 				echo "session required		pam_script.so"  >> /etc/pam.d/common-session
 			fi
diff --git a/debian/postrm b/debian/postrm
new file mode 100644
index 0000000..a55d27a
--- /dev/null
+++ b/debian/postrm
@@ -0,0 +1,6 @@
+#!/bin/sh
+# postrm script for ahenk
+#
+
+cp /etc/pam.d/common-session /etc/pam.d/common-session.before_remove_ahenk
+cp /etc/pam.d/common-session.orig /etc/pam.d/common-session