diff --git a/lib/Qpsmtpd/Base.pm b/lib/Qpsmtpd/Base.pm
index 1d2f4d4..cfe88ff 100644
--- a/lib/Qpsmtpd/Base.pm
+++ b/lib/Qpsmtpd/Base.pm
@@ -42,8 +42,7 @@ sub is_valid_ip {
 sub is_ipv6 {
     my ($self, $ip) = @_;
     return if !$ip;
-    return 1 if Net::IP::ip_is_ipv6($ip);
-    return;
+    return Net::IP::ip_is_ipv6($ip);
 };
 
 1;