diff --git a/iot-lab_M3/include/periph_conf.h b/iot-lab_M3/include/periph_conf.h
index 715678b..4fc6651 100644
--- a/iot-lab_M3/include/periph_conf.h
+++ b/iot-lab_M3/include/periph_conf.h
@@ -7,7 +7,7 @@
  */
 #define TIMER_NUMOF         (2U)
 #define TIMER_0_EN          1
-#define TIMER_1_EN          0
+#define TIMER_1_EN          1
 
 /* Timer 0 configuration */
 #define TIMER_0_DEV         TIM2