diff --git a/src/msw/choice.cpp b/src/msw/choice.cpp
index 9e9cde38ca..af029bf042 100644
--- a/src/msw/choice.cpp
+++ b/src/msw/choice.cpp
@@ -503,6 +503,8 @@ void wxChoice::DoSetSize(int x, int y,
             SendMessage(GetHwnd(), CB_SETITEMHEIGHT, (WPARAM)-1, h + delta);
         }
     }
+#else
+    wxUnusedVar(heightOrig);
 #endif
 }