diff --git a/plugin_wrapper.pl b/plugin_wrapper.pl
old mode 100755
new mode 100644
index 3db473f..4390715
--- a/plugin_wrapper.pl
+++ b/plugin_wrapper.pl
@@ -64,6 +64,11 @@ if ($p_rc == 255) {
 
 my $p_output = join('', @p_output);
 print $p_output;
+
+if (($p_rc < 0) || ($p_rc > 3)) {
+	$p_rc = 3;
+}
+
 exit $p_rc;
 
 sub exit_usage {