diff --git a/samples/keyboard/keyboard.cpp b/samples/keyboard/keyboard.cpp
index a5d356a67c..5761792e18 100644
--- a/samples/keyboard/keyboard.cpp
+++ b/samples/keyboard/keyboard.cpp
@@ -116,7 +116,7 @@ private:
         }
     }
 
-    virtual void DoLogString(const wxChar *szString, time_t WXUNUSED(t))
+    virtual void DoLogString(const wxString& szString, time_t WXUNUSED(t))
     {
         wxString msg;
         TimeStamp(&msg);