diff --git a/Shorewall/Perl/Shorewall/Providers.pm b/Shorewall/Perl/Shorewall/Providers.pm
index b90dd76c4..087b02721 100644
--- a/Shorewall/Perl/Shorewall/Providers.pm
+++ b/Shorewall/Perl/Shorewall/Providers.pm
@@ -616,8 +616,16 @@ sub process_a_provider( $ ) {
 	fatal_error "MARK not allowed with 'tproxy'"           if $mark ne '-';
 	fatal_error "'persistent' is not valid with 'tproxy"   if $persistent;
 	$mark = $globals{TPROXY_MARK};
+    } elsif ( $interfaceref->{options}{routefilter} ) {
+	if ( $config{USE_DEFAULT_RT} ) {
+	    fatal_error "Provider interfaces may not specify 'routefilter' when USE_DEFAULT_RT=Yes";
+	} else {
+	    fatal_error "Provider interfaces may not specify 'routefilter' without 'balance' or 'primary'" unless $balance;
+	}
     }
 
+
+
     my $val = 0;
     my $pref;