diff --git a/hw/char/stm32l4x5_usart.c b/hw/char/stm32l4x5_usart.c
index 02f666308c..fc5dcac0c4 100644
--- a/hw/char/stm32l4x5_usart.c
+++ b/hw/char/stm32l4x5_usart.c
@@ -56,7 +56,7 @@ REG32(CR1, 0x00)
     FIELD(CR1, UE, 0, 1)     /* USART enable */
 REG32(CR2, 0x04)
     FIELD(CR2, ADD_1, 28, 4)    /* ADD[7:4] */
-    FIELD(CR2, ADD_0, 24, 1)    /* ADD[3:0] */
+    FIELD(CR2, ADD_0, 24, 4)    /* ADD[3:0] */
     FIELD(CR2, RTOEN, 23, 1)    /* Receiver timeout enable */
     FIELD(CR2, ABRMOD, 21, 2)   /* Auto baud rate mode */
     FIELD(CR2, ABREN, 20, 1)    /* Auto baud rate enable */