diff --git a/lib/Qpsmtpd.pm b/lib/Qpsmtpd.pm
index 382aea7..b5b7169 100644
--- a/lib/Qpsmtpd.pm
+++ b/lib/Qpsmtpd.pm
@@ -230,7 +230,7 @@ sub _load_plugins {
     my $package = "Qpsmtpd::Plugin::$plugin_name";
 
     # don't reload plugins if they are already loaded
-    unless ( defined &{"${package}::register"} ) {
+    unless ( defined &{"${package}::plugin_name"} ) {
       Qpsmtpd::Plugin->compile($plugin_name,
         $package, "$dir/$plugin", $self->{_test_mode});
       $self->log(LOGDEBUG, "Loading $plugin_line") 
diff --git a/lib/Qpsmtpd/Plugin.pm b/lib/Qpsmtpd/Plugin.pm
index 48f3a43..6f8b124 100644
--- a/lib/Qpsmtpd/Plugin.pm
+++ b/lib/Qpsmtpd/Plugin.pm
@@ -94,8 +94,8 @@ sub isa_plugin {
   $cleanParent =~ s/\W/_/g;
   my $newPackage = $currentPackage."::_isa_$cleanParent";
 
-
-  return if defined &{"${newPackage}::register"};
+  # don't reload plugins if they are already loaded
+  return if defined &{"${newPackage}::plugin_name"};
 
   $self->compile($self->plugin_name . "_isa_$cleanParent",
                     $newPackage,