--- a/debian/postrm	Mon Nov 09 12:41:00 2015 +0100
+++ b/debian/postrm	Mon Nov 09 21:51:46 2015 +0100
@@ -23,14 +23,18 @@
 
 case "$1" in
     purge)
-	TMP=`tempfile`
+	TMP=`mktemp`
 	grep -v "$CRT" <$CONF >$TMP
-	cat <$TMP >$CONF
+	cp $TMP $CONF
 	rm $TMP
 	update-ca-certificates --fresh
     ;;
 
     remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
+	tmp=`mktemp`
+	grep -F -v 'schlittermann-ca.crt' $CONF
+	cp $tmp $CONF
+	rm $tmp
 	update-ca-certificates --fresh
     ;;