diff --git a/CMakeLists.txt b/CMakeLists.txt
index 522fcb3c..2e3d601d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,14 +111,14 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
 endif()
 
 if (NOT MSVC)
-  if(NOT CMAKE_CXX_FLAGS MATCHES "-std=")
+  if(NOT CMAKE_CXX_FLAGS MATCHES "-std=" AND NOT CXX_STANDARD AND NOT CMAKE_CXX_STANDARD)
     # use C++11 by default if supported
     check_cxx_compiler_flag("-std=c++11" COMPILER_SUPPORTS_CXX11)
     if(COMPILER_SUPPORTS_CXX11)
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     endif()
   endif()
-  if(NOT CMAKE_C_FLAGS MATCHES "-std=")
+  if(NOT CMAKE_C_FLAGS MATCHES "-std=" AND NOT C_STANDARD AND NOT CMAKE_C_STANDARD)
     check_c_compiler_flag("-std=c11" COMPILER_SUPPORTS_C11)
     if(COMPILER_SUPPORTS_C11)
       set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11")