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-rw-r--r--platforms/avr/drivers/serial.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/platforms/avr/drivers/serial.c b/platforms/avr/drivers/serial.c
index 6a36aa5f7f..730d9b7a01 100644
--- a/platforms/avr/drivers/serial.c
+++ b/platforms/avr/drivers/serial.c
@@ -498,6 +498,10 @@ bool soft_serial_transaction(int sstd_index) {
sei();
return true;
}
+#else
+# ifndef USE_I2C
+# error SOFT_SERIAL_PIN or USE_I2C is required but has not been defined.
+# endif
#endif
// Helix serial.c history