diff --git a/drivers/usbdev/cdcacm.c b/drivers/usbdev/cdcacm.c
index 2243c769b0..91d1052269 100644
--- a/drivers/usbdev/cdcacm.c
+++ b/drivers/usbdev/cdcacm.c
@@ -1642,6 +1642,7 @@ static void cdcacm_disconnect(FAR struct usbdevclass_driver_s *driver,
 
   priv->serdev.xmit.head = 0;
   priv->serdev.xmit.tail = 0;
+  priv->rxhead = 0;
   irqrestore(flags);
 
   /* Perform the soft connect function so that we will we can be
diff --git a/drivers/usbdev/pl2303.c b/drivers/usbdev/pl2303.c
index 9788734c5b..102160725e 100644
--- a/drivers/usbdev/pl2303.c
+++ b/drivers/usbdev/pl2303.c
@@ -1907,6 +1907,7 @@ static void usbclass_disconnect(FAR struct usbdevclass_driver_s *driver,
 
   priv->serdev.xmit.head = 0;
   priv->serdev.xmit.tail = 0;
+  priv->rxhead = 0;
   irqrestore(flags);
 
   /* Perform the soft connect function so that we will we can be