diff --git a/vulkan/api/templates/vulkan_h.tmpl b/vulkan/api/templates/vulkan_h.tmpl
index 2dee541..c55107d 100644
--- a/vulkan/api/templates/vulkan_h.tmpl
+++ b/vulkan/api/templates/vulkan_h.tmpl
@@ -53,7 +53,7 @@
 #define VK_API_VERSION \
     VK_MAKE_VERSION({{Global "VERSION_MAJOR"}}, {{Global "VERSION_MINOR"}}, {{Global "VERSION_PATCH"}})
 ¶
-#if defined(__cplusplus) && (_MSC_VER >= 1800 || __cplusplus >= 201103L)
+#if defined(__cplusplus) && ((defined(_MSC_VER) && _MSC_VER >= 1800 || __cplusplus >= 201103L)
     #define VK_NULL_HANDLE nullptr
 #else
     #define VK_NULL_HANDLE 0