diff --git a/src/java/davmail/imap/ImapConnection.java b/src/java/davmail/imap/ImapConnection.java
index cc0d2406..2c55a212 100644
--- a/src/java/davmail/imap/ImapConnection.java
+++ b/src/java/davmail/imap/ImapConnection.java
@@ -802,7 +802,7 @@ public class ImapConnection extends AbstractConnection {
             int startIndex = partIndexString.indexOf('(');
             int endIndex = partIndexString.indexOf(')');
             if (startIndex >= 0 && endIndex >= 0) {
-                return partIndexString.substring(startIndex + 1, endIndex - 1).split(" ");
+                return partIndexString.substring(startIndex + 1, endIndex).split(" ");
             } else {
                 return null;
             }