diff --git a/src/saveload/waypoint_sl.cpp b/src/saveload/waypoint_sl.cpp
--- a/src/saveload/waypoint_sl.cpp
+++ b/src/saveload/waypoint_sl.cpp
@@ -225,7 +225,7 @@ static void Ptrs_WAYP()
 }
 
 static const ChunkHandler waypoint_chunk_handlers[] = {
-	{ 'CHKP', nullptr, Load_WAYP, Ptrs_WAYP, nullptr, CH_ARRAY },
+	{ 'CHKP', nullptr, Load_WAYP, Ptrs_WAYP, nullptr, CH_READONLY },
 };
 
 extern const ChunkHandlerTable _waypoint_chunk_handlers(waypoint_chunk_handlers);