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diff --git a/engines/adl/adl_v4.h b/engines/adl/adl_v4.h
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+++ b/engines/adl/adl_v4.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef ADL_ADL_V4_H
+#define ADL_ADL_V4_H
+
+#include "adl/adl_v3.h"
+
+namespace Common {
+class RandomSource;
+}
+
+struct DiskOffset {
+	byte track;
+	byte sector;
+};
+
+namespace Adl {
+
+class AdlEngine_v4 : public AdlEngine_v3 {
+public:
+	virtual ~AdlEngine_v4() { }
+
+protected:
+	AdlEngine_v4(OSystem *syst, const AdlGameDescription *gd);
+
+	// AdlEngine
+	virtual void setupOpcodeTables();
+	virtual Common::String loadMessage(uint idx) const;
+	Common::String getItemDescription(const Item &item) const;
+
+	// AdlEngine_v2
+	virtual DataBlockPtr readDataBlockPtr(Common::ReadStream &f) const;
+
+	void applyDiskOffset(byte &track, byte &sector) const;
+
+	int o4_isVarGT(ScriptEnv &e);
+	int o4_isItemInRoom(ScriptEnv &e);
+	int o4_isNounNotInRoom(ScriptEnv &e);
+	int o4_skipOneCommand(ScriptEnv &e);
+	int o4_listInv(ScriptEnv &e);
+	int o4_moveItem(ScriptEnv &e);
+	int o4_dummy(ScriptEnv &e);
+	int o4_setTextMode(ScriptEnv &e);
+	int o4_setDisk(ScriptEnv &e);
+	int o4_sound(ScriptEnv &e);
+
+	byte _curDisk;
+	Common::Array<DiskOffset> _diskOffsets;
+};
+
+} // End of namespace Adl
+
+#endif