diff --git a/cores/arduino/pinDefinitions.h b/cores/arduino/pinDefinitions.h
index 7df17a804..ebb36131d 100644
--- a/cores/arduino/pinDefinitions.h
+++ b/cores/arduino/pinDefinitions.h
@@ -1,3 +1,6 @@
+#ifndef PIN_DEFINITIONS_H
+#define PIN_DEFINITIONS_H
+
#ifdef USE_ARDUINO_PINOUT
#include "drivers/InterruptIn.h"
@@ -36,4 +39,6 @@ PinName digitalPinToPinName(pin_size_t P);
int PinNameToIndex(PinName P);
-#endif
\ No newline at end of file
+#endif // USE_ARDUINO_PINOUT
+
+#endif // PIN_DEFINITIONS_H
\ No newline at end of file
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