diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9d6be231f..c988a8003 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -420,23 +420,23 @@ if(NOT (CMAKE_VERSION VERSION_LESS "3.1"))
 else()
     if((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND NOT WIN32)
         if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6.1.1")
-            add_compile_options(-std=c++11)
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
         else()
-            add_compile_options(-std=c++14)
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
         endif()
     endif()
     if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         if(OS_IS_MACOSX)
             if(CLANG_VERSION VERSION_LESS "600")
-                add_compile_options(-std=c++11)
+                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
             else()
-                add_compile_options(-std=c++14)
+                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
             endif()
         else()
             if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.5.0")
-                add_compile_options(-std=c++11)
+                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
             else()
-                add_compile_options(-std=c++14)
+                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
             endif()
         endif()
     endif()