diff --git a/CMakeLists.txt b/CMakeLists.txt
index 43ce320b..e08ae48d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -504,9 +504,9 @@ CHECK_CXX_COMPILER_FLAG("-Wunused-local-typedefs" CXX_UNUSED_LOCAL_TYPEDEFS)
 CHECK_CXX_COMPILER_FLAG("-Wunused-variable" CXX_WUNUSED_VARIABLE)
 
 # gcc 10 complains about this
-CHECK_C_COMPILER_FLAG("-Wstringop-overflow" CC_STRINGOP_OVERFLOW)
-if(CC_STRINGOP_OVERFLOW)
+if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10)
     set(EXTRA_C_FLAGS "${EXTRA_C_FLAGS} -Wno-stringop-overflow")
+    set(EXTRA_CXX_FLAGS "${EXTRA_CXX_FLAGS} -Wno-stringop-overflow")
 endif()
 
 include_directories(SYSTEM ${Boost_INCLUDE_DIRS})