diff --git a/example-cdc-gnu-linux/usb-cdc.c b/example-cdc-gnu-linux/usb-cdc.c
index f223127..b742bfa 100644
--- a/example-cdc-gnu-linux/usb-cdc.c
+++ b/example-cdc-gnu-linux/usb-cdc.c
@@ -768,7 +768,7 @@ tty_main (void *arg)
 	  && t->flag_send_ready)
 	{
 	  uint8_t line[32];
-	  int len = get_chars_from_ringbuffer (t, line, sizeof (len));
+	  int len = get_chars_from_ringbuffer (t, line, sizeof (line));
 
 	  if (len)
 	    {
diff --git a/example-cdc/usb-cdc.c b/example-cdc/usb-cdc.c
index 5d46e83..c3d7827 100644
--- a/example-cdc/usb-cdc.c
+++ b/example-cdc/usb-cdc.c
@@ -780,7 +780,7 @@ tty_main (void *arg)
 	  && t->flag_send_ready)
 	{
 	  uint8_t line[32];
-	  int len = get_chars_from_ringbuffer (t, line, sizeof (len));
+	  int len = get_chars_from_ringbuffer (t, line, sizeof (line));
 
 	  if (len)
 	    {
diff --git a/example-fs-bb48/usb-cdc.c b/example-fs-bb48/usb-cdc.c
index 8e13411..88ccf9f 100644
--- a/example-fs-bb48/usb-cdc.c
+++ b/example-fs-bb48/usb-cdc.c
@@ -768,7 +768,7 @@ tty_main (void *arg)
 	  && t->flag_send_ready)
 	{
 	  uint8_t line[32];
-	  int len = get_chars_from_ringbuffer (t, line, sizeof (len));
+	  int len = get_chars_from_ringbuffer (t, line, sizeof (line));
 
 	  if (len)
 	    {