diff --git a/reactos/win32ss/user/ntuser/callback.c b/reactos/win32ss/user/ntuser/callback.c
index d8f81e83e94..a6112e87e1e 100644
--- a/reactos/win32ss/user/ntuser/callback.c
+++ b/reactos/win32ss/user/ntuser/callback.c
@@ -753,9 +753,9 @@ co_IntCallHookProc(INT HookId,
                }
             break;
             case HCBT_MOVESIZE:
-               if (Common->lParam && lParam)
+               if (Extra && lParam)
                {
-                  RtlCopyMemory((PVOID) lParam, (PVOID) Common->lParam, sizeof(RECTL));
+                  RtlCopyMemory((PVOID) lParam, Extra, sizeof(RECTL));
                }
             break;
          }