diff --git a/targets/TARGET_NUVOTON/TARGET_M451/can_api.c b/targets/TARGET_NUVOTON/TARGET_M451/can_api.c
index 775f98f8b0..ece4ede7b6 100644
--- a/targets/TARGET_NUVOTON/TARGET_M451/can_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_M451/can_api.c
@@ -286,14 +286,15 @@ int can_mode(can_t *obj, CanMode mode)
 int can_filter(can_t *obj, uint32_t id, uint32_t mask, CANFormat format, int32_t handle)
 {
     uint32_t numask = mask;
-    if( numask == 0x0000 )
-    {
+
+    if (numask == 0x0000) {
       return CAN_SetRxMsg((CAN_T *)NU_MODBASE(obj->can), handle, (uint32_t)format, id);
     }
-    if( format == CANStandard )
-    {
+
+    if (format == CANStandard) {
       numask = (mask << 18);
     }
+
     numask = (numask | CAN_IF_MASK2_MDIR_Msk | CAN_IF_MASK2_MXTD_Msk);
     return CAN_SetRxMsgAndMsk((CAN_T *)NU_MODBASE(obj->can), handle, (uint32_t)format, id, numask);
 }
diff --git a/targets/TARGET_NUVOTON/TARGET_M480/can_api.c b/targets/TARGET_NUVOTON/TARGET_M480/can_api.c
index e82ad24911..88d44fca82 100644
--- a/targets/TARGET_NUVOTON/TARGET_M480/can_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_M480/can_api.c
@@ -330,14 +330,15 @@ int can_mode(can_t *obj, CanMode mode)
 int can_filter(can_t *obj, uint32_t id, uint32_t mask, CANFormat format, int32_t handle)
 {
     uint32_t numask = mask;
-    if( numask == 0x0000 )
-    {
+
+    if (numask == 0x0000) {
       return CAN_SetRxMsg((CAN_T *)NU_MODBASE(obj->can), handle, (uint32_t)format, id);
     }
-    if( format == CANStandard )
-    {
+
+    if (format == CANStandard) {
       numask = (mask << 18);
     }
+
     numask = (numask | CAN_IF_MASK2_MDIR_Msk | CAN_IF_MASK2_MXTD_Msk);
     return CAN_SetRxMsgAndMsk((CAN_T *)NU_MODBASE(obj->can), handle, (uint32_t)format, id, numask);
 }