1 files changed, 1 insertions, 0 deletions
diff --git a/FS/FS/svc_acct.pm b/FS/FS/svc_acct.pm
index 8376d7bd0..d6d132b41 100644
--- a/FS/FS/svc_acct.pm
+++ b/FS/FS/svc_acct.pm
@@ -1408,6 +1408,7 @@ sub radius_reply {
       my $is = $whatis{$what}.'bytes';
       if ( $self->$is() =~ /\d/ ) {
         my $big = new Math::BigInt $self->$is();
+        $big = new Math::BigInto '0' if $big->is_neg();
         my $att = "Chillispot-Max-\u$what";
         $reply{"$att-Octets"}    = $big->copy->band(0xffffffff)->bstr;
         $reply{"$att-Gigawords"} = $big->copy->brsft(32)->bstr;