diff --git a/win32ss/user/ntuser/message.c b/win32ss/user/ntuser/message.c
index c8cfededfba..3f7bcfb03bd 100644
--- a/win32ss/user/ntuser/message.c
+++ b/win32ss/user/ntuser/message.c
@@ -164,7 +164,7 @@ static UINT FASTCALL
 MsgMemorySize(PMSGMEMORY MsgMemoryEntry, WPARAM wParam, LPARAM lParam)
 {
     CREATESTRUCTW *Cs;
-    PUNICODE_STRING WindowName;
+    PLARGE_STRING WindowName;
     PUNICODE_STRING ClassName;
     UINT Size = 0;
 
@@ -196,7 +196,7 @@ MsgMemorySize(PMSGMEMORY MsgMemoryEntry, WPARAM wParam, LPARAM lParam)
             case WM_CREATE:
             case WM_NCCREATE:
                 Cs = (CREATESTRUCTW *) lParam;
-                WindowName = (PUNICODE_STRING) Cs->lpszName;
+                WindowName = (PLARGE_STRING) Cs->lpszName;
                 ClassName = (PUNICODE_STRING) Cs->lpszClass;
                 Size = sizeof(CREATESTRUCTW) + WindowName->Length + sizeof(WCHAR);
                 if (IS_ATOM(ClassName->Buffer))