diff --git a/cores/esp32/Arduino.h b/cores/esp32/Arduino.h
index 1a4e7b98993..c757cef27ec 100644
--- a/cores/esp32/Arduino.h
+++ b/cores/esp32/Arduino.h
@@ -138,7 +138,7 @@
 #endif
 #define EXTERNAL_NUM_INTERRUPTS NUM_DIGITAL_PINS  // All GPIOs
 #define analogInputToDigitalPin(p)  (((p)<NUM_ANALOG_INPUTS)?(analogChannelToDigitalPin(p)):-1)
-#define digitalPinToInterrupt(p)    ((((uint8_t)digitalPinToGPIONumber(p))<NUM_DIGITAL_PINS)?digitalPinToGPIONumber(p):NOT_AN_INTERRUPT)
+#define digitalPinToInterrupt(p)    ((((uint8_t)digitalPinToGPIONumber(p))<NUM_DIGITAL_PINS)?(p):NOT_AN_INTERRUPT)
 #define digitalPinHasPWM(p)         (((uint8_t)digitalPinToGPIONumber(p))<NUM_DIGITAL_PINS)
 
 typedef bool boolean;