diff --git a/samples/controls/controls.cpp b/samples/controls/controls.cpp
index a2350f332b..ce73f4a7c0 100644
--- a/samples/controls/controls.cpp
+++ b/samples/controls/controls.cpp
@@ -1288,7 +1288,7 @@ void MyPanel::OnChangeCheck(wxCommandEvent& event)
 {
     // check/uncheck all the items in the wxCheckListBox
     for (unsigned int n=0; n < m_listbox->GetCount(); n++) {
-        m_listbox->Check(n, event.GetInt());
+        m_listbox->Check(n, event.GetInt() != 0);
     }
 }