diff --git a/Shorewall/install.sh b/Shorewall/install.sh
index e8c8a4170..26a89933e 100755
--- a/Shorewall/install.sh
+++ b/Shorewall/install.sh
@@ -106,7 +106,6 @@ if [ -z "$INIT" ] ; then
 	INIT="shorewall"
 fi
 
-PLAIN=
 SPARSE=
 MANDIR=${MANDIR:-"/usr/share/man"}
 [ -n "${LIBEXEC:=/usr/share}" ]
diff --git a/Shorewall6/install.sh b/Shorewall6/install.sh
index 403e24825..70ba23732 100755
--- a/Shorewall6/install.sh
+++ b/Shorewall6/install.sh
@@ -104,7 +104,6 @@ if [ -z "$INIT" ] ; then
 	INIT="shorewall6"
 fi
 
-PLAIN=
 DEBIAN=
 CYGWIN=
 MAC=