diff --git a/dlls/advapi32/security.c b/dlls/advapi32/security.c
index 15ba8b56f0..1c6c172712 100644
--- a/dlls/advapi32/security.c
+++ b/dlls/advapi32/security.c
@@ -739,3 +739,26 @@ AccessCheck(PSECURITY_DESCRIPTOR pSecurityDescriptor, HANDLE ClientToken,
     *AccessStatus = TRUE;
     return TRUE;
 }
+
+/*************************************************************************
+ * SetThreadToken [ADVAPI32.231]
+ *
+ * Assigns an "impersonation token" to a thread so it can assume the
+ * security privledges of another thread or process.  Can also remove
+ * a previously assigned token.  Only supported on NT - it's a stub 
+ * exactly like this one on Win9X.
+ *
+ */
+
+BOOL WINAPI SetThreadToken(PHANDLE thread, HANDLE token)
+{
+    FIXME_(advapi)("(%p, %p): stub\n", thread, token);
+
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+
+    return FALSE;
+}
+
+
+
+
diff --git a/relay32/advapi32.spec b/relay32/advapi32.spec
index 4c705be553..4124fa1dab 100644
--- a/relay32/advapi32.spec
+++ b/relay32/advapi32.spec
@@ -232,7 +232,7 @@ type	win32
 0228 stub SetServiceBits
 0229 stub SetServiceObjectSecurity
 0230 stdcall SetServiceStatus(long long)SetServiceStatus
-0231 stub SetThreadToken
+0231 stdcall SetThreadToken (ptr ptr) SetThreadToken
 0232 stub SetTokenInformation
 0233 stdcall StartServiceA(long long ptr) StartServiceA
 0234 stdcall StartServiceCtrlDispatcherA(ptr) StartServiceCtrlDispatcherA