diff --git a/configs/xtrs/src/xtr_serial.c b/configs/xtrs/src/xtr_serial.c
index 623188d98f..46d9cad72e 100644
--- a/configs/xtrs/src/xtr_serial.c
+++ b/configs/xtrs/src/xtr_serial.c
@@ -118,7 +118,7 @@ static bool up_txready(FAR struct uart_dev_s *dev);
 static bool up_txempty(FAR struct uart_dev_s *dev);
 
 /****************************************************************************
- * Private Variables
+ * Private Data
  ****************************************************************************/
 
 static const struct uart_ops_s g_uart_ops =
diff --git a/configs/z80sim/src/z80_serial.c b/configs/z80sim/src/z80_serial.c
index e30f1b0bf1..24cc42db76 100644
--- a/configs/z80sim/src/z80_serial.c
+++ b/configs/z80sim/src/z80_serial.c
@@ -83,7 +83,7 @@ static bool up_txready(FAR struct uart_dev_s *dev);
 static bool up_txempty(FAR struct uart_dev_s *dev);
 
 /****************************************************************************
- * Private Variables
+ * Private Data
  ****************************************************************************/
 
 static const struct uart_ops_s g_uart_ops =