diff --git a/IO_Modbus.cpp b/IO_Modbus.cpp
index 1da5223..f7b0b22 100644
--- a/IO_Modbus.cpp
+++ b/IO_Modbus.cpp
@@ -17,7 +17,7 @@
  *  You should have received a copy of the GNU General Public License
  *  along with CommandStation.  If not, see <https://www.gnu.org/licenses/>.
  */
-#if defined(MBEXPERIMENTAL) || defined(ARDUINO_ARCH_STM32)
+
 #include "IO_Modbus.h"
 #include "defines.h"
 void ModbusADU::setTransactionId(uint16_t transactionId) {
@@ -646,4 +646,3 @@ Modbusnode::Modbusnode(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t nodeID,
   }
   
 }
-#endif
\ No newline at end of file
diff --git a/IO_Modbus.h b/IO_Modbus.h
index 070365e..d0f4779 100644
--- a/IO_Modbus.h
+++ b/IO_Modbus.h
@@ -51,7 +51,7 @@
 
 #ifndef IO_MODBUS_H
 #define IO_MODBUS_H
-#if defined(MBEXPERIMENTAL) || defined(ARDUINO_ARCH_STM32)
+
 #include "IODevice.h"
 class ModbusADU {
   public:
@@ -408,5 +408,5 @@ public:
   }
 };
 
-#endif
+
 #endif // IO_MODBUS_H