diff --git a/plugins/helo b/plugins/helo
index c444adc..06bc320 100644
--- a/plugins/helo
+++ b/plugins/helo
@@ -345,7 +345,7 @@ sub invalid_localhost {
         $self->log(LOGDEBUG, "pass, is localhost");
         return;
     }
-    if ($host && lc $host eq 'localhost') {
+    if ($host && lc $host ne 'localhost') {
         $self->log(LOGDEBUG, "pass, host is localhost");
         return;
     };