diff --git a/lib/imap.c b/lib/imap.c
index 505a6ba21c183026a79ea76340bc9d8d9b777c00..50201e151bec60afee685a8963288956e2ad3b40 100644
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -889,6 +889,8 @@ static CURLcode imap_disconnect(struct connectdata *conn)
 
   Curl_pp_disconnect(&imapc->pp);
 
+  free(imapc->mailbox);
+
   return CURLE_OK;
 }