diff --git a/src/newgrf_commons.h b/src/newgrf_commons.h
--- a/src/newgrf_commons.h
+++ b/src/newgrf_commons.h
@@ -309,7 +309,7 @@ bool Convert8bitBooleanCallback(const st
  */
 template <size_t Tcnt>
 struct GRFFilePropsBase {
-	GRFFilePropsBase() : local_id(0), grffile(0)
+	GRFFilePropsBase() : local_id(0), grffile(nullptr)
 	{
 		/* The lack of some compilers to provide default constructors complying to the specs
 		 * requires us to zero the stuff ourself. */