diff --git a/.github/workflows/compile-examples.yml b/.github/workflows/compile-examples.yml
index c692243..3dfa684 100644
--- a/.github/workflows/compile-examples.yml
+++ b/.github/workflows/compile-examples.yml
@@ -61,6 +61,9 @@ jobs:
           - fqbn: arduino:mbed_portenta:envie_m7
             platforms: |
               - name: arduino:mbed_portenta
+          - fqbn: arduino:mbed_opta:opta
+            platforms: |
+              - name: arduino:mbed_opta
 
     steps:
       - name: Checkout repository
diff --git a/library.properties b/library.properties
index 2883b58..879479d 100644
--- a/library.properties
+++ b/library.properties
@@ -1,10 +1,10 @@
 name=ArduinoRS485
-version=1.0.4
+version=1.0.5
 author=Arduino
 maintainer=Arduino <info@arduino.cc>
 sentence=Enables sending and receiving data using the RS-485 standard with RS-485 shields, like the MKR 485 Shield.
 paragraph=This library supports the Maxim Integrated MAX3157 and equivalent chipsets.
 category=Communication
 url=http://www.arduino.cc/en/Reference/ArduinoRS485
-architectures=*
+architectures=samd,mbed_portenta,mbed_opta
 includes=ArduinoRS485.h
diff --git a/src/RS485.cpp b/src/RS485.cpp
index 20a6451..5c8842d 100644
--- a/src/RS485.cpp
+++ b/src/RS485.cpp
@@ -76,7 +76,12 @@ void RS485Class::begin(unsigned long baudrate, uint16_t config, int predelay, in
 
   _transmisionBegun = false;
 
+#if defined(ARDUINO_OPTA)
+  auto _opta_uart = static_cast<UART *>(_serial);
+  _opta_uart->begin(baudrate, config, true);
+#else
   _serial->begin(baudrate, config);
+#endif 
 }
 
 void RS485Class::end()