diff --git a/boot/espressif/tools/toolchain-esp32s3.cmake b/boot/espressif/tools/toolchain-esp32s3.cmake
index 43bb918..de3e3da 100644
--- a/boot/espressif/tools/toolchain-esp32s3.cmake
+++ b/boot/espressif/tools/toolchain-esp32s3.cmake
@@ -7,8 +7,10 @@
 set(CMAKE_C_COMPILER xtensa-esp32s3-elf-gcc)
 set(CMAKE_CXX_COMPILER xtensa-esp32s3-elf-g++)
 set(CMAKE_ASM_COMPILER xtensa-esp32s3-elf-gcc)
+set(_CMAKE_TOOLCHAIN_PREFIX xtensa-esp32s3-elf-)
 
-set(CMAKE_C_FLAGS "-mlongcalls" CACHE STRING "C Compiler Base Flags")
-set(CMAKE_CXX_FLAGS "-mlongcalls" CACHE STRING "C++ Compiler Base Flags")
+set(CMAKE_C_FLAGS "-mlongcalls" CACHE STRING "C Compiler Base Flags" FORCE)
+set(CMAKE_CXX_FLAGS "-mlongcalls" CACHE STRING "C++ Compiler Base Flags" FORCE)
+set(CMAKE_ASM_FLAGS "${UNIQ_CMAKE_ASM_FLAGS}" CACHE STRING "ASM Compiler Base Flags" FORCE)
 
 set(CMAKE_EXE_LINKER_FLAGS "-Wl,--gc-sections" CACHE STRING "Linker Base Flags")