diff --git a/cmake/DefaultCFlags.cmake b/cmake/DefaultCFlags.cmake
index e5d4dde..ebad32c 100644
--- a/cmake/DefaultCFlags.cmake
+++ b/cmake/DefaultCFlags.cmake
@@ -28,11 +28,11 @@ set (CMAKE_CXX_FLAGS_COVERAGE "${CMAKE_C_FLAGS_COVERAGE} -fno-elide-constructors
 
 #####################################
 # Set all the global build flags
-set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
-set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}} -std=c++11")
-set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_LINK_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
-set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_LINK_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
-set (CMAKE_MODULE_LINKER_FLAGS "${CMAKE_LINK_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
+set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
+set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}} -std=c++11")
+set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_LINK_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
+set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CMAKE_LINK_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
+set (CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${CMAKE_LINK_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
 
 # Compiler-specific C++11 activation.
 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")