diff --git a/Shorewall/install.sh b/Shorewall/install.sh
index 76eddd198..a266a7514 100755
--- a/Shorewall/install.sh
+++ b/Shorewall/install.sh
@@ -917,6 +917,10 @@ if [ -z "$SPARSE" -a ! -f ${DESTDIR}/etc/$PRODUCT/clear ]; then
     echo "Clear file installed as ${DESTDIR}/etc/$PRODUCT/clear"
 fi
 #
+# Install the Isusable file
+#
+run_install $OWNERSHIP -m 0644 isusable ${DESTDIR}/usr/share/$PRODUCT/configfiles/isusable
+#
 # Install the Refresh file
 #
 run_install $OWNERSHIP -m 0644 refresh ${DESTDIR}/usr/share/$PRODUCT/configfiles/refresh
diff --git a/Shorewall6/configfiles/isusable b/Shorewall6/configfiles/isusable
index 4225743c8..7a4dd97fc 100644
--- a/Shorewall6/configfiles/isusable
+++ b/Shorewall6/configfiles/isusable
@@ -8,13 +8,15 @@
 #
 #	The script is invoked inside a function that accepts an interface
 #	name as a single argument. The file below is designed to work with
-#	both swping and lsm as described at http://www.shorewall.net/MultiISP.html
+#	both swping and lsm as described at
+#	http://www.shorewall.net/MultiISP.html
 #
 # See http://shorewall.net/shorewall_extension_scripts.htm for additional
 # information.
 #
 ###############################################################################
-local status=0
+local status
+status=0
 
 [ -f ${VARDIR}/${1}.status ] && status=$(cat ${VARDIR}/${1}.status)