diff --git a/include/libopencm3/stm32/can.h b/include/libopencm3/stm32/can.h
index 62db1f36..5d09da67 100644
--- a/include/libopencm3/stm32/can.h
+++ b/include/libopencm3/stm32/can.h
@@ -480,7 +480,7 @@ LGPL License Terms @ref lgpl_license
 /* 15:10 Reserved, forced by hardware to 0 */
 
 /* BRP[9:0]: Baud rate prescaler */
-#define CAN_BTR_BRP_MASK		(0x1FFUL << 0)
+#define CAN_BTR_BRP_MASK		(0x3FFUL << 0)
 
 /* --- CAN_TIxR values ------------------------------------------------------ */