diff --git a/include/uuid.h b/include/uuid.h
index d48059d..4d14e4d 100644
--- a/include/uuid.h
+++ b/include/uuid.h
@@ -17,15 +17,6 @@
 #include <numeric>
 #include <atomic>
 
-#ifdef __cplusplus
-
-#  if (__cplusplus >= 202002L) || (defined(_MSVC_LANG) && _MSVC_LANG >= 202002L)
-#    define LIBUUID_CPP20_OR_GREATER
-#  endif
-
-#endif
-
-
 #ifdef LIBUUID_CPP20_OR_GREATER
 #include <span>
 #else
@@ -66,7 +57,7 @@
 
 namespace uuids
 {
-#ifdef __cpp_lib_span
+#if defined(LIBUUID_CPP20_OR_GREATER)
    template <class ElementType, std::size_t Extent>
    using span = std::span<ElementType, Extent>;
 #else