diff --git a/reactos/dll/win32/user32/windows/message.c b/reactos/dll/win32/user32/windows/message.c
index f602fc0a90c..438174d388e 100644
--- a/reactos/dll/win32/user32/windows/message.c
+++ b/reactos/dll/win32/user32/windows/message.c
@@ -1709,7 +1709,7 @@ WINAPI
 PostQuitMessage(
   int nExitCode)
 {
-  (void) NtUserPostMessage(NULL, WM_QUIT, nExitCode, 0);
+    NtUserCallOneParam(nExitCode, ONEPARAM_ROUTINE_POSTQUITMESSAGE);
 }
 
 
diff --git a/reactos/subsystems/win32/win32k/ntuser/simplecall.c b/reactos/subsystems/win32/win32k/ntuser/simplecall.c
index abdb2f6415f..fcc58eea8b5 100644
--- a/reactos/subsystems/win32/win32k/ntuser/simplecall.c
+++ b/reactos/subsystems/win32/win32k/ntuser/simplecall.c
@@ -152,6 +152,13 @@ NtUserCallOneParam(
 
    switch(Routine)
    {
+      case ONEPARAM_ROUTINE_POSTQUITMESSAGE:
+          {
+                PTHREADINFO pti;
+                pti = PsGetCurrentThreadWin32Thread();
+                MsqPostQuitMessage(pti->MessageQueue, Param);
+                RETURN(TRUE);
+          }
       case ONEPARAM_ROUTINE_SHOWCURSOR:
          RETURN( (DWORD)UserShowCursor((BOOL)Param) );