diff --git a/samples/typetest/typetest.cpp b/samples/typetest/typetest.cpp
index bb345ae8c0..0859c51c88 100644
--- a/samples/typetest/typetest.cpp
+++ b/samples/typetest/typetest.cpp
@@ -233,7 +233,7 @@ void MyApp::DoStreamDemo(wxCommandEvent& WXUNUSED(event))
     textCtrl.WriteText( tmp );
     
     ui32 = data_input.Read32();
-    tmp.Printf( "Unsigned int32: %d\n", ui32 );
+    tmp.Printf( "Unsigned int32: %u\n", ui32 );
     textCtrl.WriteText( tmp );
 
     d = data_input.ReadDouble();