diff --git a/src/saveload/newgrf_sl.cpp b/src/saveload/newgrf_sl.cpp
--- a/src/saveload/newgrf_sl.cpp
+++ b/src/saveload/newgrf_sl.cpp
@@ -55,5 +55,5 @@ static void Load_NGRF()
 }
 
 extern const ChunkHandler _newgrf_chunk_handlers[] = {
-	{ 'NGRF', Save_NGRF, Load_NGRF, NULL, CH_ARRAY | CH_LAST }
+	{ 'NGRF', Save_NGRF, Load_NGRF, NULL, NULL, CH_ARRAY | CH_LAST }
 };