diff --git a/boards/sensebox_samd21/Makefile.features b/boards/sensebox_samd21/Makefile.features
index df6f5c09f4..e5b79684b9 100644
--- a/boards/sensebox_samd21/Makefile.features
+++ b/boards/sensebox_samd21/Makefile.features
@@ -5,6 +5,7 @@ CPU_MODEL = samd21g18a
 FEATURES_PROVIDED += periph_adc
 FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_rtc
+FEATURES_PROVIDED += periph_rtt
 FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
diff --git a/boards/sensebox_samd21/include/periph_conf.h b/boards/sensebox_samd21/include/periph_conf.h
index 050f61d970..741193e076 100644
--- a/boards/sensebox_samd21/include/periph_conf.h
+++ b/boards/sensebox_samd21/include/periph_conf.h
@@ -210,11 +210,12 @@ static const i2c_conf_t i2c_config[] = {
 #define I2C_NUMOF          ARRAY_SIZE(i2c_config)
 
 /**
- * @name    RTC configuration
+ * @name RTT configuration
  * @{
  */
-#define RTC_DEV             RTC->MODE2
-
+#ifndef RTT_FREQUENCY
+#define RTT_FREQUENCY       (32768U)    /* in Hz. For changes see `rtc_rtt.c` */
+#endif
 /** @} */
 
 /**