diff --git a/std/os/windows/advapi32.zig b/std/os/windows/advapi32.zig
index dcb5a636ea..64a820a3b1 100644
--- a/std/os/windows/advapi32.zig
+++ b/std/os/windows/advapi32.zig
@@ -28,3 +28,8 @@ pub extern "advapi32" stdcallcc fn RegOpenKeyExW(hKey: HKEY, lpSubKey: LPCWSTR,
 
 pub extern "advapi32" stdcallcc fn RegQueryValueExW(hKey: HKEY, lpValueName: LPCWSTR, lpReserved: LPDWORD,
     lpType: LPDWORD, lpData: LPBYTE, lpcbData: LPDWORD,) LSTATUS;
+
+// RtlGenRandom is known as SystemFunction036 under advapi32
+// http://msdn.microsoft.com/en-us/library/windows/desktop/aa387694.aspx */
+pub extern "advapi32" stdcallcc fn SystemFunction036(output: PVOID, length: ULONG_PTR) BOOL;
+pub const RtlGenRandom = SystemFunction036;