diff --git a/src/msw/spinbutt.cpp b/src/msw/spinbutt.cpp
index 7ca93d2cb8..59f3dd5bf8 100644
--- a/src/msw/spinbutt.cpp
+++ b/src/msw/spinbutt.cpp
@@ -246,7 +246,7 @@ bool wxSpinButton::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
 
 bool wxSpinButton::MSWOnNotify(int WXUNUSED(idCtrl), WXLPARAM lParam, WXLPARAM *result)
 {
-    NM_UPDOWN lpnmud = (NM_UPDOWN *)lParam;
+    NM_UPDOWN *lpnmud = (NM_UPDOWN *)lParam;
 
     if (lpnmud->hdr.hwndFrom != GetHwnd()) // make sure it is the right control
         return FALSE;