diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index 2ea528e817..5fc412bb6b 100644
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -1780,7 +1780,7 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                     // there's a GPF in Windows.
                     // By returning TRUE here, we avoid further processing
                     // of this strange message.
-                    if ( info->iItem >= GetColumnCount() )
+                    if ( (unsigned)info->iItem >= (unsigned)GetColumnCount() )
                         return TRUE;
                 }
                 // fall through