diff --git a/NPLib/ressources/CMake/NPTool_CMake_Preamble.cmake b/NPLib/ressources/CMake/NPTool_CMake_Preamble.cmake
index 753896f0ef7747c11107e0e59fb158be210a7b3f..de72507570cf0b1fbffa5d937af011dd9752c7e9 100644
--- a/NPLib/ressources/CMake/NPTool_CMake_Preamble.cmake
+++ b/NPLib/ressources/CMake/NPTool_CMake_Preamble.cmake
@@ -33,7 +33,7 @@ endif()
 
 # If compiler is GCC active the color diagnostic
 if(${CMAKE_CXX_COMPILER_ID} MATCHES ".*GNU.*")
-set(CMAKE_CXX_FLAGS -march=native "${CMAKE_CXX_FLAGS} ")
+set(CMAKE_CXX_FLAGS "-march=native ${CMAKE_CXX_FLAGS} ")
 execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
                 OUTPUT_VARIABLE GCC_VERSION)
   if (GCC_VERSION VERSION_GREATER 4.9 OR GCC_VERSION VERSION_EQUAL 4.9)