diff --git a/lib/imap.c b/lib/imap.c
index d240fb3a90..1feeb7330d 100644
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -471,6 +471,7 @@ static void state(struct connectdata *conn, imapstate newstate)
     "FETCH_FINAL",
     "APPEND",
     "APPEND_FINAL",
+    "CUSTOM",
     "LOGOUT",
     /* LAST */
   };
diff --git a/lib/imap.h b/lib/imap.h
index c124703bb4..b92a14d51b 100644
--- a/lib/imap.h
+++ b/lib/imap.h
@@ -50,6 +50,7 @@ typedef enum {
   IMAP_FETCH_FINAL,
   IMAP_APPEND,
   IMAP_APPEND_FINAL,
+  IMAP_CUSTOM,
   IMAP_LOGOUT,
   IMAP_LAST          /* never used */
 } imapstate;