diff --git a/arch/risc-v/src/esp32c3/esp32c3_spiflash_mtd.c b/arch/risc-v/src/esp32c3/esp32c3_spiflash_mtd.c
index 68dc75d791f..36fae3cdcc9 100644
--- a/arch/risc-v/src/esp32c3/esp32c3_spiflash_mtd.c
+++ b/arch/risc-v/src/esp32c3/esp32c3_spiflash_mtd.c
@@ -102,12 +102,6 @@ static ssize_t esp32c3_bwrite_encrypt(struct mtd_dev_s *dev,
 static int esp32c3_ioctl(struct mtd_dev_s *dev, int cmd,
                          unsigned long arg);
 
-/****************************************************************************
- * Public Data
- ****************************************************************************/
-
-extern const struct spiflash_legacy_data_s *rom_spiflash_legacy_data;
-
 /****************************************************************************
  * Private Data
  ****************************************************************************/
diff --git a/arch/risc-v/src/esp32c3/rom/esp32c3_spiflash.h b/arch/risc-v/src/esp32c3/rom/esp32c3_spiflash.h
index ca6bfe0cc7c..aa5a87f3923 100644
--- a/arch/risc-v/src/esp32c3/rom/esp32c3_spiflash.h
+++ b/arch/risc-v/src/esp32c3/rom/esp32c3_spiflash.h
@@ -989,7 +989,8 @@ int spi_flash_erase_range(uint32_t start_address, uint32_t size);
  *
  * Returned Values:
  *   Return true if both CPUs have flash cache enabled, false otherwise.
- */
+ *
+ *****************************************************************************/
 
 bool spi_flash_cache_enabled(void);
 
@@ -1001,15 +1002,16 @@ bool spi_flash_cache_enabled(void);
  *
  * Parameters:
  *   cpuid - core number to enable instruction cache for.
- */
+ *
+ *****************************************************************************/
 
 void spi_flash_enable_cache(uint32_t cpuid);
 
-/* Global esp32c3_spiflash_chip_t structure used by ROM functions */
+/*****************************************************************************
+ * Public Data
+ *****************************************************************************/
 
-extern esp32c3_spiflash_chip_t g_rom_flashchip;
-
-extern uint8_t g_rom_spiflash_dummy_len_plus[];
+extern const struct spiflash_legacy_data_s *rom_spiflash_legacy_data;
 
 #ifdef __cplusplus
 }