diff --git a/reactos/include/psdk/specstrings.h b/reactos/include/psdk/specstrings.h
index 462b7858d0e..a8207257743 100644
--- a/reactos/include/psdk/specstrings.h
+++ b/reactos/include/psdk/specstrings.h
@@ -48,3 +48,13 @@
 #define __analysis_noreturn
 #define __kernel_entry
 
+#if (_MSC_VER >= 1000) && !defined(__midl) && defined(_PREFAST_)
+
+#define __inner_data_source(src_raw)        _SA_annotes1(SAL_untrusted_data_source,src_raw)
+#define __out_data_source(src_sym)          _Post_ __inner_data_source(#src_sym)
+
+#else
+
+#define __out_data_source(src_sym)
+
+#endif