diff --git a/firmware/inc/si_trx.h b/firmware/inc/si_trx.h
index 0f5b087..37c994d 100644
--- a/firmware/inc/si_trx.h
+++ b/firmware/inc/si_trx.h
@@ -28,6 +28,7 @@
 #include "samd20.h"
 
 struct si_frequency_configuration {
+  uint32_t frequency;
   uint8_t outdiv, band, nprescaler;
   uint32_t m; uint16_t n;
   float lsb_tuning_resolution;
diff --git a/firmware/src/si_trx.c b/firmware/src/si_trx.c
index 8a17bab..fd01a9d 100644
--- a/firmware/src/si_trx.c
+++ b/firmware/src/si_trx.c
@@ -435,6 +435,8 @@ static void si_trx_set_tx_pa_duty_cycle(uint8_t pa_duty_cycle)
 void si_trx_get_frequency_configuration(struct si_frequency_configuration* config,
                                         uint32_t frequency)
 {
+  config->frequency = frequency;
+
   /* Higher frequency resolution, but also higher power (~+200µA) */
   config->nprescaler = 2;