diff --git a/osrf_testing_tools_cpp/include/osrf_testing_tools_cpp/variant_helper.hpp b/osrf_testing_tools_cpp/include/osrf_testing_tools_cpp/variant_helper.hpp
index c153052..3ade3b8 100644
--- a/osrf_testing_tools_cpp/include/osrf_testing_tools_cpp/variant_helper.hpp
+++ b/osrf_testing_tools_cpp/include/osrf_testing_tools_cpp/variant_helper.hpp
@@ -18,7 +18,7 @@
 #if defined(__has_include)
 
 # if __has_include(<variant>)
-#  if _MSC_VER < 2000  // this is any version @ VS 2017 and earlier
+#  if defined(_MSC_VER) && _MSC_VER < 2000  // this is any version @ VS 2017 and earlier
 // VS 2017 (_MSC_VER or 19XX) has <variant>, but it just contains an error macro...
 #   define __SHOULD_USE_MPARK_VARIANT 1
 #  else  // _MSC_VER < 2000