diff --git a/resource.cpp b/resource.cpp
index adae2dd4c02..38ed41c1c43 100644
--- a/resource.cpp
+++ b/resource.cpp
@@ -96,6 +96,8 @@ void Scumm::openRoom(int room) {
 		if (openResourceFile(buf)) {
 			if (room==0)
 				return;
+			if (_features & GF_EXTERNAL_CHARSET && room>=roomlimit)
+				return;
 			readRoomsOffsets();
 			_fileOffset = _roomFileOffsets[room];