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diff --git a/src/reflowscan.h b/src/reflowscan.h
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+/*
+Minetest
+Copyright (C) 2016 MillersMan <millersman@users.noreply.github.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser 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 REFLOWSCAN_H
+#define REFLOWSCAN_H
+
+#include "util/container.h"
+#include "irrlichttypes_bloated.h"
+
+class INodeDefManager;
+class Map;
+class MapBlock;
+
+class ReflowScan {
+public:
+	ReflowScan(Map *map, INodeDefManager *ndef);
+	void scan(MapBlock *block, UniqueQueue<v3s16> *liquid_queue);
+
+private:
+	MapBlock *lookupBlock(int x, int y, int z);
+	bool isLiquidFlowableTo(int x, int y, int z);
+	bool isLiquidHorizontallyFlowable(int x, int y, int z);
+	void scanColumn(int x, int z);
+
+private:
+	Map *m_map;
+	INodeDefManager *m_ndef;
+	v3s16 m_block_pos, m_rel_block_pos;
+	UniqueQueue<v3s16> *m_liquid_queue;
+	MapBlock *m_lookup[3 * 3 * 3];
+	u32 m_lookup_state_bitset;
+};
+
+#endif // REFLOWSCAN_H