diff --git a/components/esp_phy/esp32c61/include/phy_init_data.h b/components/esp_phy/esp32c61/include/phy_init_data.h
index 8a0eb240168..011632fa74f 100644
--- a/components/esp_phy/esp32c61/include/phy_init_data.h
+++ b/components/esp_phy/esp32c61/include/phy_init_data.h
@@ -26,8 +26,8 @@ extern "C" {
 #if CONFIG_ESP_PHY_MULTIPLE_INIT_DATA_BIN
 #define PHY_CRC_ALGORITHM 1
 #define PHY_COUNTRY_CODE_LEN 2
-#define PHY_INIT_DATA_TYPE_OFFSET 254
-#define PHY_SUPPORT_MULTIPLE_BIN_OFFSET 253
+#define PHY_INIT_DATA_TYPE_OFFSET 126
+#define PHY_SUPPORT_MULTIPLE_BIN_OFFSET 125
 #endif
 
 extern const char phy_init_magic_pre[];
diff --git a/components/esp_phy/src/phy_init.c b/components/esp_phy/src/phy_init.c
index 0c8ef30e6e3..9ebf4905e46 100644
--- a/components/esp_phy/src/phy_init.c
+++ b/components/esp_phy/src/phy_init.c
@@ -118,6 +118,13 @@ static uint8_t s_phy_modem_init_ref = 0;
 extern uint8_t multi_phy_init_data_bin_start[] asm("_binary_phy_multiple_init_data_bin_start");
 extern uint8_t multi_phy_init_data_bin_end[]   asm("_binary_phy_multiple_init_data_bin_end");
 #endif
+
+/* Both flags live in the last bytes of an init data entry */
+_Static_assert(PHY_INIT_DATA_TYPE_OFFSET == sizeof(esp_phy_init_data_t) - 2,
+               "PHY_INIT_DATA_TYPE_OFFSET does not match the PHY init data of this target");
+_Static_assert(PHY_SUPPORT_MULTIPLE_BIN_OFFSET == sizeof(esp_phy_init_data_t) - 3,
+               "PHY_SUPPORT_MULTIPLE_BIN_OFFSET does not match the PHY init data of this target");
+
 /* The following static variables are only used by Wi-Fi tasks, so they can be handled without lock */
 static phy_init_data_type_t s_phy_init_data_type = 0;