diff --git a/variants/Geekble_ESP32C3/pins_arduino.h b/variants/Geekble_ESP32C3/pins_arduino.h
index 0a7b6eb5646..b36d5e16bc6 100644
--- a/variants/Geekble_ESP32C3/pins_arduino.h
+++ b/variants/Geekble_ESP32C3/pins_arduino.h
@@ -7,6 +7,10 @@ static const uint8_t LED_BUILTIN = 10;
 #define BUILTIN_LED LED_BUILTIN  // backward compatibility
 #define LED_BUILTIN LED_BUILTIN  // allow testing #ifdef LED_BUILTIN
 
+static const uint8_t SW_BUILTIN = 9;
+#define BUILTIN_SW SW_BUILTIN  // backward compatibility
+#define SW_BUILTIN SW_BUILTIN  // allow testing #ifdef SW_BUILTIN
+
 static const uint8_t TX = 21;
 static const uint8_t RX = 20;