diff --git a/lib/imap.c b/lib/imap.c
index 505a6ba21..50201e151 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;
 }