diff --git a/Shorewall/Perl/Shorewall/Providers.pm b/Shorewall/Perl/Shorewall/Providers.pm
index d7f2dbc92..68a86bf96 100644
--- a/Shorewall/Perl/Shorewall/Providers.pm
+++ b/Shorewall/Perl/Shorewall/Providers.pm
@@ -706,7 +706,7 @@ sub process_a_provider( $ ) {
     if ( $track ) {
 	if ( $routemarked_interfaces{$interface} ) {
 	    fatal_error "Interface $interface is tracked through an earlier provider" if $routemarked_interfaces{$interface} == ROUTEMARKED_UNSHARED;
-	    fatal_error "Multiple providers through the same interface must their IP address specified in the INTERFACES" unless $shared;
+	    fatal_error "Multiple providers through the same interface must have their IP address specified in the INTERFACES column" unless $shared;
 	} else {
 	    $routemarked_interfaces{$interface} = $shared ? ROUTEMARKED_SHARED : ROUTEMARKED_UNSHARED;
 	    push @routemarked_interfaces, $interface;