diff --git a/lib/sensor_sdm120.c b/lib/sensor_sdm120.c
index 77f4951..76c6510 100644
--- a/lib/sensor_sdm120.c
+++ b/lib/sensor_sdm120.c
@@ -45,7 +45,7 @@
  *  @{
  */
 #define SENSOR_SDM120_REDE_PORT B /**< GPIO port for RS-485 receiver and driver output enable signal */
-#define SENSOR_SDM120_REDE_PIN 12 /**< GPIO pin for RS-485 receiver and driver output enable signal */
+#define SENSOR_SDM120_REDE_PIN 1 /**< GPIO pin for RS-485 receiver and driver output enable signal */
 /** @} */
 
 /** @defgroup sensor_sdm120_timer timer peripheral to enforce waiting time between messages