diff --git a/src/org/p2pvpn/gui/InviteWindow.java b/src/org/p2pvpn/gui/InviteWindow.java
index 24f623b..3f73dc1 100644
--- a/src/org/p2pvpn/gui/InviteWindow.java
+++ b/src/org/p2pvpn/gui/InviteWindow.java
@@ -303,12 +303,14 @@ public class InviteWindow extends javax.swing.JDialog implements ClipboardOwner
             lblDate.setEnabled(false);
             radNever.setEnabled(false);
             radDate.setEnabled(false);
+            btnCalendar.setEnabled(false);
         } else {
             lblNote.setVisible(true);
             spnExpiryDate.setEnabled(true);
             lblDate.setEnabled(true);
             radNever.setEnabled(true);
             radDate.setEnabled(true);
+            btnCalendar.setEnabled(true);
         }
     }// GEN-LAST:event_chkNetworkItemStateChanged