diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0c784f5c1..6b90703a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,7 +86,9 @@ endif()
 add_definitions(-D_USE_MATH_DEFINES)
 
 # Let CMake handle setting C++11 (since 3.1)
-set(CMAKE_CXX_STANDARD 14)
+if(NOT CMAKE_CXX_STANDARD)
+  set(CMAKE_CXX_STANDARD 14)
+endif()
 set(CMAKE_C_STANDARD 11)
 
 # Use our cmake files