diff --git a/boards/common/blxxxpill/Makefile.features b/boards/common/blxxxpill/Makefile.features
index 4a5fb7b385..45e0f483f0 100644
--- a/boards/common/blxxxpill/Makefile.features
+++ b/boards/common/blxxxpill/Makefile.features
@@ -4,6 +4,7 @@ CPU = stm32f1
 FEATURES_PROVIDED += periph_adc
 FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_pwm
+FEATURES_PROVIDED += periph_rtt
 FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
diff --git a/boards/common/blxxxpill/include/periph_conf.h b/boards/common/blxxxpill/include/periph_conf.h
index 7127e6b786..9e5ada8a45 100644
--- a/boards/common/blxxxpill/include/periph_conf.h
+++ b/boards/common/blxxxpill/include/periph_conf.h
@@ -59,6 +59,15 @@ extern "C" {
 #define CLOCK_PLL_MUL        (9)
 /** @} */
 
+/**
+ * @name    Real time counter configuration
+ * @{
+ */
+#ifndef RTT_FREQUENCY
+#define RTT_FREQUENCY       (16384)      /* in Hz */
+#endif
+/** @} */
+
 /**
  * @name    ADC configuration
  * @{