diff --git a/Shorewall/Perl/Shorewall/Chains.pm b/Shorewall/Perl/Shorewall/Chains.pm
index 8352c434f..a4832a994 100644
--- a/Shorewall/Perl/Shorewall/Chains.pm
+++ b/Shorewall/Perl/Shorewall/Chains.pm
@@ -8893,7 +8893,7 @@ sub ensure_ipsets( @ ) {
     if ( $globals{DBL_TIMEOUT} ne '' && $_[0] eq $globals{DBL_IPSET} ) {
 	shift;
 
-	emit( qq(    if qt \$IPSET list $globals{DBL_IPSET}; then));
+	emit( qq(    if ! qt \$IPSET list $globals{DBL_IPSET}; then));
 
 	push_indent;