diff --git a/python/build/cmake.py b/python/build/cmake.py
index 4f1af6a1f..b41d14698 100644
--- a/python/build/cmake.py
+++ b/python/build/cmake.py
@@ -26,8 +26,8 @@ set(CMAKE_SYSTEM_PROCESSOR {toolchain.actual_arch.split('-', 1)[0]})
 set(CMAKE_C_COMPILER_TARGET {toolchain.actual_arch})
 set(CMAKE_CXX_COMPILER_TARGET {toolchain.actual_arch})
 
-set(CMAKE_C_FLAGS "{toolchain.cflags} {toolchain.cppflags}")
-set(CMAKE_CXX_FLAGS "{toolchain.cxxflags} {toolchain.cppflags}")
+set(CMAKE_C_FLAGS_INIT "{toolchain.cflags} {toolchain.cppflags}")
+set(CMAKE_CXX_FLAGS_INIT "{toolchain.cxxflags} {toolchain.cppflags}")
 """)
     __write_cmake_compiler(f, 'C', toolchain.cc)
     __write_cmake_compiler(f, 'CXX', toolchain.cxx)