diff --git a/lib/pop3.c b/lib/pop3.c
index 8da045e48..7f97722a8 100644
--- a/lib/pop3.c
+++ b/lib/pop3.c
@@ -237,6 +237,7 @@ static void state(struct connectdata *conn,
     "PASS",
     "STARTTLS",
     "LIST",
+    "LIST_SINGLE",
     "RETR",
     "QUIT",
     /* LAST */