diff --git a/reactos/dll/win32/user32/windows/messagebox.c b/reactos/dll/win32/user32/windows/messagebox.c
index 85e72992959..ba43796fc36 100644
--- a/reactos/dll/win32/user32/windows/messagebox.c
+++ b/reactos/dll/win32/user32/windows/messagebox.c
@@ -378,7 +378,7 @@ MessageBoxTimeoutIndirectW(
 
     tpl = (DLGTEMPLATE *)buf;
 
-    tpl->style = WS_CAPTION | WS_POPUP | WS_VISIBLE | WS_CLIPSIBLINGS | WS_SYSMENU | DS_CENTER | DS_MODALFRAME | DS_NOIDLEMSG;
+    tpl->style = WS_CAPTION | WS_POPUP | WS_VISIBLE | WS_CLIPSIBLINGS | DS_CENTER | DS_MODALFRAME | DS_NOIDLEMSG;
     tpl->dwExtendedStyle = WS_EX_DLGMODALFRAME | WS_EX_WINDOWEDGE | WS_EX_CONTROLPARENT;
     if(lpMsgBoxParams->dwStyle & MB_TOPMOST)
       tpl->dwExtendedStyle |= WS_EX_TOPMOST;