diff --git a/Shorewall/Perl/Shorewall/Compiler.pm b/Shorewall/Perl/Shorewall/Compiler.pm
index f6870fcc4..004cee6bc 100644
--- a/Shorewall/Perl/Shorewall/Compiler.pm
+++ b/Shorewall/Perl/Shorewall/Compiler.pm
@@ -682,6 +682,7 @@ sub compiler {
     setup_zone_mss;
 
     unless ( $command eq 'check' ) {
+	emit 'return 0';
 	pop_indent;
 	emit '}';
     }