diff --git a/Marlin/src/HAL/HAL_STM32/SoftwareSerial.cpp b/Marlin/src/HAL/HAL_STM32/SoftwareSerial.cpp
index 39fed33826..2d2883f4ce 100644
--- a/Marlin/src/HAL/HAL_STM32/SoftwareSerial.cpp
+++ b/Marlin/src/HAL/HAL_STM32/SoftwareSerial.cpp
@@ -34,6 +34,8 @@
 //
 // Includes
 //
+#if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
+
 #include "SoftwareSerial.h"
 #include "timers.h"
 
@@ -389,3 +391,5 @@ int SoftwareSerial::peek() {
   // Read from "head"
   return _receive_buffer[_receive_buffer_head];
 }
+
+#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC