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-rw-r--r--keyboards/helix/serial.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/keyboards/helix/serial.c b/keyboards/helix/serial.c
index 182f22219..591941587 100644
--- a/keyboards/helix/serial.c
+++ b/keyboards/helix/serial.c
@@ -110,16 +110,18 @@ void serial_master_init(void) {
void serial_slave_init(void) {
serial_input_with_pullup();
-#ifndef USE_SERIAL_PD2
+#if SERIAL_PIN_MASK == _BV(PD0)
// Enable INT0
EIMSK |= _BV(INT0);
// Trigger on falling edge of INT0
EICRA &= ~(_BV(ISC00) | _BV(ISC01));
-#else
+#elif SERIAL_PIN_MASK == _BV(PD2)
// Enable INT2
EIMSK |= _BV(INT2);
// Trigger on falling edge of INT2
EICRA &= ~(_BV(ISC20) | _BV(ISC21));
+#else
+ #error unknown SERIAL_PIN_MASK value
#endif
}