diff --git a/hardware/arduino/cores/arduino/HardwareSerial.cpp b/hardware/arduino/cores/arduino/HardwareSerial.cpp
index 2d6d25f9f..1ae90c3f7 100644
--- a/hardware/arduino/cores/arduino/HardwareSerial.cpp
+++ b/hardware/arduino/cores/arduino/HardwareSerial.cpp
@@ -495,3 +495,4 @@ HardwareSerial::operator bool() {
 #endif
 
 #endif // whole file
+