diff --git a/lib/net/imap/response_parser.rb b/lib/net/imap/response_parser.rb
index 3535792b..e608c6d8 100644
--- a/lib/net/imap/response_parser.rb
+++ b/lib/net/imap/response_parser.rb
@@ -1743,6 +1743,7 @@ def status_att_val
           when "SIZE"          then number64            # RFC8483, RFC9051
           when "HIGHESTMODSEQ" then mod_sequence_valzer # RFC7162
           when "MAILBOXID"     then parens__objectid    # RFC8474
+          when "APPENDLIMIT"   then NIL? ? nil : number  # RFC7889
           else
             number? || ExtensionData.new(tagged_ext_val)
           end
diff --git a/test/net/imap/fixtures/response_parser/status_responses.yml b/test/net/imap/fixtures/response_parser/status_responses.yml
index 59ff251a..b1223ac0 100644
--- a/test/net/imap/fixtures/response_parser/status_responses.yml
+++ b/test/net/imap/fixtures/response_parser/status_responses.yml
@@ -25,6 +25,16 @@
           UIDVALIDITY: 1234
       raw_data: "* STATUS INBOX (UIDNEXT 1 UIDVALIDITY 1234)\r\n"
 
+  test_status_response_appendlimit_nil:
+    :response: "* STATUS INBOX (APPENDLIMIT NIL)\r\n"
+    :expected: !ruby/struct:Net::IMAP::UntaggedResponse
+      name: STATUS
+      data: !ruby/struct:Net::IMAP::StatusData
+        mailbox: INBOX
+        attr:
+          APPENDLIMIT:
+      raw_data: "* STATUS INBOX (APPENDLIMIT NIL)\r\n"
+
   test_status_response_empty_attribute_list:
     :response: "* STATUS INBOX ()\r\n"
     :expected: !ruby/struct:Net::IMAP::UntaggedResponse