diff --git a/src/pal/pal_windows.h b/src/pal/pal_windows.h
index 1a62908..ca81635 100644
--- a/src/pal/pal_windows.h
+++ b/src/pal/pal_windows.h
@@ -73,7 +73,8 @@ namespace snmalloc
       if (committed)
         flags |= MEM_COMMIT;
 
-#  if (WINVER >= _WIN32_WINNT_WIN10) && !defined(USE_SYSTEMATIC_TESTING)
+#  if (NTDDI_VERSION >= NTDDI_WIN10_RS5) && (WINVER >= _WIN32_WINNT_WIN10) && \
+    !defined(USE_SYSTEMATIC_TESTING)
       // If we're on Windows 10 or newer, we can use the VirtualAlloc2
       // function.  The FromApp variant is useable by UWP applications and
       // cannot allocate executable memory.