diff --git a/Shorewall/Perl/Shorewall/Tc.pm b/Shorewall/Perl/Shorewall/Tc.pm
index 44672be67..ee8b30c19 100644
--- a/Shorewall/Perl/Shorewall/Tc.pm
+++ b/Shorewall/Perl/Shorewall/Tc.pm
@@ -546,7 +546,7 @@ sub calculate_quantum( $$ ) {
 sub process_in_bandwidth( $ ) {
     my $in_rate     = shift;
     
-    return 0 if $in_rate eq '-';
+    return 0 if $in_rate eq '-' or $in_rate eq '0';
 
     my $in_burst    = '10kb';
     my $in_avrate   = 0;