diff --git a/libraries/Arduino_CAN/src/Arduino_CAN.cpp b/libraries/Arduino_CAN/src/Arduino_CAN.cpp
index de74c22c5..30690e83f 100644
--- a/libraries/Arduino_CAN/src/Arduino_CAN.cpp
+++ b/libraries/Arduino_CAN/src/Arduino_CAN.cpp
@@ -57,7 +57,10 @@ int Arduino_CAN::write(CanMsg const & msg)
CANData,
is_standard_id ? CANStandard : CANExtended);
- return _can.write(can_msg);
+ int const rc = _can.write(can_msg);
+ if (rc == 0) /* mbed returns 0 in case of failed CAN::write(). */
+ return -1; /* Note: provide named constant in ArduinoCore-API/HardwareCAN.h, i.e. CAN_WRITE_GENERIC_ERROR */
+ return 1;
}
size_t Arduino_CAN::available()
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