diff --git a/table_windows.go b/table_windows.go
index e2aecf1..1be54a6 100644
--- a/table_windows.go
+++ b/table_windows.go
@@ -48,6 +48,7 @@ func finishNewTable(b *tablebase, ty reflect.Type) Table {
 		}
 		colname := toUTF16(ty.Field(i).Name)
 		C.SendMessageW(t.hwnd, C.tableAddColumn, coltype, C.LPARAM(uintptr(unsafe.Pointer(colname))))
+		// TODO free colname
 	}
 	t.colcount = C.int(ty.NumField())
 	return t
diff --git a/wininclude_windows.h b/wininclude_windows.h
index 64e7caf..2a6c717 100644
--- a/wininclude_windows.h
+++ b/wininclude_windows.h
@@ -5,6 +5,8 @@
 #define STRICT_TYPED_ITEMIDS
 #define CINTERFACE
 #define COBJMACROS
+// see https://github.com/golang/go/issues/9916#issuecomment-74812211
+#define INITGUID
 // get Windows version right; right now Windows XP
 #define WINVER 0x0501
 #define _WIN32_WINNT 0x0501