diff --git a/Shorewall/Perl/Shorewall/Tc.pm b/Shorewall/Perl/Shorewall/Tc.pm
index 955fd7b60..bd441fe07 100644
--- a/Shorewall/Perl/Shorewall/Tc.pm
+++ b/Shorewall/Perl/Shorewall/Tc.pm
@@ -331,13 +331,13 @@ sub process_tc_rule( ) {
 			    if ( defined $m1 && $m1 ne '' ) {
 				$val = numeric_value ($m1);
 				fatal_error "Invalid Mask ($m1)" unless defined $val && $val && $val <= 0xffffffff;
-				$mask1 = in_hex ( $m1 & 0xffffffff );
+				$mask1 = in_hex ( $val & 0xffffffff );
 			    }
 
 			    if ( defined $m2 && $m2 ne '' ) {
 				$val = numeric_value ($m2);
 				fatal_error "Invalid Mask ($m2)" unless defined $val && $val <= 0xffffffff;
-				$mask2 = in_hex ( $m2 & 0xffffffff );
+				$mask2 = in_hex ( $val & 0xffffffff );
 			    }
 
 			    if ( defined $s ) {