diff --git a/sonoff/sonoff_post.h b/sonoff/sonoff_post.h
index 7f50782c6..a4d6c2871 100644
--- a/sonoff/sonoff_post.h
+++ b/sonoff/sonoff_post.h
@@ -131,6 +131,7 @@ void KNX_CB_Action(message_t const &msg, void *arg);
 #define USE_ADE7953                           // Enable ADE7953 Energy monitor as used on Shelly 2.5 (I2C address 0x38) (+1k5)
 //#define USE_VL53L0X                           // Enable VL53L0x time of flight sensor (I2C address 0x29) (+4k code)
 //#define USE_MLX90614                          // Enable MLX90614 ir temp sensor (I2C address 0x5a) (+0.6k code)
+#define USE_CHIRP                             // Enable CHIRP soil moisture sensor (variable I2C address)
 
 #define USE_MHZ19                             // Add support for MH-Z19 CO2 sensor (+2k code)
 #define USE_SENSEAIR                          // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
diff --git a/sonoff/xsns_48_chirp.ino b/sonoff/xsns_48_chirp.ino
index 4c5d6eb26..6a33f23ee 100644
--- a/sonoff/xsns_48_chirp.ino
+++ b/sonoff/xsns_48_chirp.ino
@@ -27,8 +27,6 @@
                     base      - code base from arendst and              - https://github.com/Miceuz/i2c-moisture-sensor
 
 */
-#define USE_I2C
-#define USE_CHIRP
 
 #ifdef USE_I2C
 #ifdef USE_CHIRP