diff --git a/boot/espressif/tools/toolchain-esp32.cmake b/boot/espressif/tools/toolchain-esp32.cmake
index 5c9c535..88f6ea3 100644
--- a/boot/espressif/tools/toolchain-esp32.cmake
+++ b/boot/espressif/tools/toolchain-esp32.cmake
@@ -3,8 +3,10 @@
 set(CMAKE_C_COMPILER xtensa-esp32-elf-gcc)
 set(CMAKE_CXX_COMPILER xtensa-esp32-elf-g++)
 set(CMAKE_ASM_COMPILER xtensa-esp32-elf-gcc)
+set(_CMAKE_TOOLCHAIN_PREFIX xtensa-esp32-elf-)
 
-set(CMAKE_C_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C Compiler Base Flags")
-set(CMAKE_CXX_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C++ Compiler Base Flags")
+set(CMAKE_C_FLAGS "${UNIQ_CMAKE_C_FLAGS}" CACHE STRING "C Compiler Base Flags" FORCE)
+set(CMAKE_CXX_FLAGS "${UNIQ_CMAKE_CXX_FLAGS}" 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")