diff --git a/components/esp_hw_support/lowpower/port/esp32c5/sleep_phy.c b/components/esp_hw_support/lowpower/port/esp32c5/sleep_phy.c
index 5febe7b7ff4..155636136b6 100644
--- a/components/esp_hw_support/lowpower/port/esp32c5/sleep_phy.c
+++ b/components/esp_hw_support/lowpower/port/esp32c5/sleep_phy.c
@@ -103,8 +103,10 @@ static esp_err_t sleep_phy_retention_init(void *arg)
     memcpy(phy_modem_config, phy_modem_config_template, sizeof(phy_modem_config_template));
 
     extern uint32_t phy_ana_i2c_master_burst_rf_onoff(bool on);
-    phy_modem_config[4].config.write_wait.value  = phy_ana_i2c_master_burst_rf_onoff(true);
-    phy_modem_config[15].config.write_wait.value = phy_ana_i2c_master_burst_rf_onoff(false);
+    phy_modem_config[5].config.write_wait.value  = phy_ana_i2c_master_burst_rf_onoff(true);
+    assert(phy_modem_config[5].config.write_wait.backup == (void *)I2C_ANA_MST_I2C_BURST_CONF_REG);
+    phy_modem_config[17].config.write_wait.value = phy_ana_i2c_master_burst_rf_onoff(false);
+    assert(phy_modem_config[17].config.write_wait.backup == (void *)I2C_ANA_MST_I2C_BURST_CONF_REG);
     esp_err_t err = sleep_retention_entries_create(phy_modem_config, ARRAY_SIZE(phy_modem_config_template), 7, SLEEP_RETENTION_MODULE_MODEM_PHY);
     free(phy_modem_config);
     ESP_RETURN_ON_ERROR(err, TAG, "failed to allocate modem phy link");
diff --git a/components/esp_hw_support/lowpower/port/esp32c6/sleep_phy.c b/components/esp_hw_support/lowpower/port/esp32c6/sleep_phy.c
index 6f8a3676c13..ff7e845e3c0 100644
--- a/components/esp_hw_support/lowpower/port/esp32c6/sleep_phy.c
+++ b/components/esp_hw_support/lowpower/port/esp32c6/sleep_phy.c
@@ -116,7 +116,9 @@ esp_err_t sleep_phy_link_init(void **link_context)
 
     extern uint32_t phy_ana_i2c_master_burst_rf_onoff(bool on);
     phy_modem_config[8].write_wait.value  = phy_ana_i2c_master_burst_rf_onoff(true);
+    assert(phy_modem_config[8].write_wait.backup == (void *)I2C_ANA_MST_I2C_BURST_CONF_REG);
     phy_modem_config[24].write_wait.value = phy_ana_i2c_master_burst_rf_onoff(false);
+    assert(phy_modem_config[24].write_wait.backup == (void *)I2C_ANA_MST_I2C_BURST_CONF_REG);
 
     void *link = NULL;
     for (int i = ARRAY_SIZE(phy_modem_config_template) - 1; (err == ESP_OK) && (i >= 0); i--) {
diff --git a/components/esp_hw_support/lowpower/port/esp32c61/sleep_phy.c b/components/esp_hw_support/lowpower/port/esp32c61/sleep_phy.c
index 9d7217284e4..a5c75bdf756 100644
--- a/components/esp_hw_support/lowpower/port/esp32c61/sleep_phy.c
+++ b/components/esp_hw_support/lowpower/port/esp32c61/sleep_phy.c
@@ -111,7 +111,9 @@ esp_err_t sleep_phy_link_init(void **link_context)
 
     extern uint32_t phy_ana_i2c_master_burst_rf_onoff(bool on);
     phy_modem_config[5].write_wait.value  = phy_ana_i2c_master_burst_rf_onoff(true);
+    assert(phy_modem_config[5].write_wait.backup == (void *)I2C_ANA_MST_I2C_BURST_CONF_REG);
     phy_modem_config[21].write_wait.value = phy_ana_i2c_master_burst_rf_onoff(false);
+    assert(phy_modem_config[21].write_wait.backup == (void *)I2C_ANA_MST_I2C_BURST_CONF_REG);
 
     void *link = NULL;
     for (int i = ARRAY_SIZE(phy_modem_config_template) - 1; (err == ESP_OK) && (i >= 0); i--) {