diff --git a/vendors/nuvoton/boards/numaker_iot_m487_wifi/CMakeLists.txt b/vendors/nuvoton/boards/numaker_iot_m487_wifi/CMakeLists.txt
index e21be27fa0d..fb490b8f334 100644
--- a/vendors/nuvoton/boards/numaker_iot_m487_wifi/CMakeLists.txt
+++ b/vendors/nuvoton/boards/numaker_iot_m487_wifi/CMakeLists.txt
@@ -24,7 +24,7 @@ afr_set_board_metadata(VENDOR_NAME "Nuvoton")
 afr_set_board_metadata(FAMILY_NAME "NuMicro M487 Series")
 afr_set_board_metadata(DATA_RAM_MEMORY "160KB")
 afr_set_board_metadata(PROGRAM_MEMORY "512KB")
-afr_set_board_metadata(CODE_SIGNER "AmazonFreeRTOS-Default")
+afr_set_board_metadata(CODE_SIGNER "null")
 afr_set_board_metadata(SUPPORTED_IDE "uVision")
 afr_set_board_metadata(RECOMMENDED_IDE "uVision")
 afr_set_board_metadata(IDE_uVision_NAME "Keil uVision")