diff --git a/lib/src/phy/ch_estimation/dmrs_pucch.c b/lib/src/phy/ch_estimation/dmrs_pucch.c
index 7a045c325..cae4cac58 100644
--- a/lib/src/phy/ch_estimation/dmrs_pucch.c
+++ b/lib/src/phy/ch_estimation/dmrs_pucch.c
@@ -238,7 +238,7 @@ int srsran_dmrs_pucch_format1_estimate(const srsran_pucch_nr_t*            q,
   res->rsrp_dBfs          = srsran_convert_power_to_dB(rsrp);
   res->epre               = epre;
   res->epre_dBfs          = srsran_convert_power_to_dB(epre);
-  res->noise_estimate     = epre - rsrp;
+  res->noise_estimate     = SRSRAN_MAX(epre - rsrp, 1e-6f);
   res->noise_estimate_dbm = srsran_convert_power_to_dB(res->noise_estimate);
   res->snr                = rsrp / res->noise_estimate;
   res->snr_db             = srsran_convert_power_to_dB(res->snr);
@@ -398,7 +398,7 @@ int srsran_dmrs_pucch_format2_estimate(const srsran_pucch_nr_t*            q,
   res->rsrp_dBfs          = srsran_convert_power_to_dB(rsrp);
   res->epre               = epre;
   res->epre_dBfs          = srsran_convert_power_to_dB(epre);
-  res->noise_estimate     = epre - rsrp;
+  res->noise_estimate     = SRSRAN_MAX(epre - rsrp, 1e-6f);
   res->noise_estimate_dbm = srsran_convert_power_to_dB(res->noise_estimate);
   res->snr                = rsrp / res->noise_estimate;
   res->snr_db             = srsran_convert_power_to_dB(res->snr);