diff --git a/reactos/dll/win32/msvcrt/msvcrt.spec b/reactos/dll/win32/msvcrt/msvcrt.spec
index 98bdd1ccf88..3a9c7cf5a8b 100644
--- a/reactos/dll/win32/msvcrt/msvcrt.spec
+++ b/reactos/dll/win32/msvcrt/msvcrt.spec
@@ -1266,9 +1266,9 @@
 @ cdecl memchr(ptr long long)
 @ cdecl memcmp(ptr ptr long)
 @ cdecl memcpy(ptr ptr long)
-# @ cdecl memcpy_s(ptr long ptr long) memmove_s
+@ cdecl memcpy_s(ptr long ptr long) memmove_s
 @ cdecl memmove(ptr ptr long)
-# @ cdecl memmove_s(ptr long ptr long)
+@ cdecl memmove_s(ptr long ptr long)
 @ cdecl memset(ptr long long)
 @ cdecl mktime(ptr)
 @ cdecl modf(double ptr)
@@ -1285,7 +1285,7 @@
 # stub qsort_s
 @ cdecl raise(long)
 @ cdecl rand()
-# @ cdecl rand_s(ptr)
+@ cdecl rand_s(ptr)
 @ cdecl realloc(ptr long)
 @ cdecl remove(str)
 @ cdecl rename(str str)
@@ -1405,3 +1405,6 @@
 @ varargs wscanf(wstr) 
 # @ varargs wscanf_s(wstr)
 
+# Functions not exported in native dll:
+@ cdecl _get_invalid_parameter_handler()
+@ cdecl _set_invalid_parameter_handler(ptr)
diff --git a/reactos/lib/sdk/crt/math/rand.c b/reactos/lib/sdk/crt/math/rand.c
index 4d560a2aac4..598d72b6d90 100644
--- a/reactos/lib/sdk/crt/math/rand.c
+++ b/reactos/lib/sdk/crt/math/rand.c
@@ -1,6 +1,6 @@
 /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
 #include <precomp.h>
-//#include <Ntsecapi.h>
+#include <ntsecapi.h>
 #include <internal/tls.h>
 
 /*
@@ -31,12 +31,17 @@ srand(unsigned int seed)
   */
 int CDECL rand_s(unsigned int *pval)
 {
-#if 0
-    if (!pval || !RtlGenRandom(pval, sizeof(*pval)))
+    BOOLEAN (WINAPI *pSystemFunction036)(PVOID, ULONG); // RtlGenRandom
+    HINSTANCE hadvapi32 = LoadLibraryA("advapi32.dll");    
+    pSystemFunction036 = (void*)GetProcAddress(hadvapi32, "SystemFunction036");
+#if 1
+    if (!pval || (pSystemFunction036 && !pSystemFunction036(pval, sizeof(*pval))))
     {
+	    _invalid_parameter(NULL,_CRT_WIDE("rand_s"),_CRT_WIDE(__FILE__),__LINE__, 0);
         *_errno() = EINVAL;
         return EINVAL;
     }
 #endif
+    if(hadvapi32) FreeLibrary(hadvapi32);
     return 0;
 }