diff --git a/upptst/PdbTests/main.cpp b/upptst/PdbTests/main.cpp
index 040056263..9af299ea4 100644
--- a/upptst/PdbTests/main.cpp
+++ b/upptst/PdbTests/main.cpp
@@ -270,7 +270,7 @@ GUI_APP_MAIN
 		WString h = "test";
 		std::wstring x = h.ToStd();
 		for(int i = 0; i < 10; i++)
-			x.append(~h);
+			x.append((wchar_t*)~h);
 	}
 	
 	{