diff --git a/components/bme280/bme280_sup.c b/components/bme280/bme280_sup.c
index cb5e79e..781f6f9 100644
--- a/components/bme280/bme280_sup.c
+++ b/components/bme280/bme280_sup.c
@@ -10,8 +10,8 @@
 #include "bme280.h"
 
 // pin numbers specific to this TTGO board
-#define SCL_PIN 21
-#define SDA_PIN 22
+#define SCL_PIN 22
+#define SDA_PIN 21
 
 int8_t user_i2c_read(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t cnt);
 int8_t user_i2c_write(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t cnt);