diff --git a/lib/NGCP/Panel/Utils/Subscriber.pm b/lib/NGCP/Panel/Utils/Subscriber.pm
index 47da79ee03..8d5f7e98cf 100644
--- a/lib/NGCP/Panel/Utils/Subscriber.pm
+++ b/lib/NGCP/Panel/Utils/Subscriber.pm
@@ -2319,7 +2319,7 @@ sub mark_voicemail_read {
     my $c = $params{c};
     my $voicemail = $params{voicemail};
     my $dir = $voicemail->dir;
-    $dir = ~s/INBOX$/Old/;
+    $dir =~ s/INBOX$/Old/;
     $voicemail->update({ dir => $dir });
     return;
 }