diff --git a/libethcore/Ethash.cpp b/libethcore/Ethash.cpp
deleted file mode 100644
index a6720850e..000000000
--- a/libethcore/Ethash.cpp
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-	This file is part of cpp-ethereum.
-
-	cpp-ethereum 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 3 of the License, or
-	(at your option) any later version.
-
-	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
-*/
-/** @file Ethash.cpp
- * @author Gav Wood <i@gavwood.com>
- * @date 2014
- */
-
-#include "Ethash.h"
-#include "EthashAux.h"
-
-namespace dev
-{
-namespace eth
-{
-
-h256 const& Ethash::BlockHeaderRaw::seedHash() const
-{
-	if (!m_seedHash)
-		m_seedHash = EthashAux::seedHash((unsigned)m_number);
-	return m_seedHash;
-}
-
-}
-}
diff --git a/libethcore/Ethash.h b/libethcore/Ethash.h
deleted file mode 100644
index fc989f624..000000000
--- a/libethcore/Ethash.h
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
-	This file is part of cpp-ethereum.
-
-	cpp-ethereum 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 3 of the License, or
-	(at your option) any later version.
-
-	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
-*/
-/** @file Ethash.h
- * @author Gav Wood <i@gavwood.com>
- * @date 2014
- *
- * A proof of work algorithm.
- */
-
-#pragma once
-
-#include <chrono>
-#include <thread>
-#include <cstdint>
-#include "Common.h"
-#include "Miner.h"
-#include "Farm.h"
-
-class ethash_cl_miner;
-class ethash_cuda_miner;
-
-namespace dev
-{
-
-class RLP;
-class RLPStream;
-
-namespace eth
-{
-
-class BlockInfo;
-class EthashCLHook;
-class EthashCUDAHook;
-
-class Ethash
-{
-public:
-	using Nonce = h64;
-
-	class BlockHeaderRaw: public BlockInfo
-	{
-
-	public:
-		h256 const& seedHash() const;
-		Nonce const& nonce() const { return m_nonce; }
-
-	protected:
-		BlockHeaderRaw() = default;
-		BlockHeaderRaw(BlockInfo const& _bi): BlockInfo(_bi) {}
-
-		void clear() { m_mixHash = h256(); m_nonce = Nonce(); }
-
-	private:
-		Nonce m_nonce;
-		h256 m_mixHash;
-
-		mutable h256 m_seedHash;
-	};
-	using BlockHeader = BlockHeaderPolished<BlockHeaderRaw>;
-};
-
-}
-}
diff --git a/libethcore/EthashAux.cpp b/libethcore/EthashAux.cpp
index fae8ce2e1..e83e8a493 100644
--- a/libethcore/EthashAux.cpp
+++ b/libethcore/EthashAux.cpp
@@ -33,6 +33,7 @@
 #include <libethash/io.h>
 #include "BlockInfo.h"
 #include "Exceptions.h"
+
 using namespace std;
 using namespace chrono;
 using namespace dev;
@@ -48,6 +49,13 @@ const unsigned EthashProofOfWork::defaultGlobalWorkSizeMultiplier = 4096; // * C
 const unsigned EthashProofOfWork::defaultMSPerBatch = 0;
 const EthashProofOfWork::WorkPackage EthashProofOfWork::NullWorkPackage = EthashProofOfWork::WorkPackage();
 
+h256 const& Ethash::BlockHeaderRaw::seedHash() const
+{
+	if (!m_seedHash)
+		m_seedHash = EthashAux::seedHash((unsigned)m_number);
+	return m_seedHash;
+}
+
 EthashAux::~EthashAux()
 {
 }
diff --git a/libethcore/EthashAux.h b/libethcore/EthashAux.h
index e41c6f130..1970f0bea 100644
--- a/libethcore/EthashAux.h
+++ b/libethcore/EthashAux.h
@@ -25,16 +25,42 @@
 #include <libethash/ethash.h>
 #include <libdevcore/Log.h>
 #include <libdevcore/Worker.h>
-#include "Ethash.h"
+#include "BlockInfo.h"
 
 namespace dev
 {
 namespace eth
 {
 
-
 struct DAGChannel: public LogChannel { static const char* name(); static const int verbosity = 1; };
 
+class Ethash
+{
+public:
+	using Nonce = h64;
+
+	class BlockHeaderRaw: public BlockInfo
+	{
+
+	public:
+		h256 const& seedHash() const;
+		Nonce const& nonce() const { return m_nonce; }
+
+	protected:
+		BlockHeaderRaw() = default;
+		BlockHeaderRaw(BlockInfo const& _bi): BlockInfo(_bi) {}
+
+		void clear() { m_mixHash = h256(); m_nonce = Nonce(); }
+
+	private:
+		Nonce m_nonce;
+		h256 m_mixHash;
+
+		mutable h256 m_seedHash;
+	};
+	using BlockHeader = BlockHeaderPolished<BlockHeaderRaw>;
+};
+
 /// Proof of work definition for Ethash.
 struct EthashProofOfWork
 {
diff --git a/libethcore/EthashCUDAMiner.h b/libethcore/EthashCUDAMiner.h
index ed8b8200c..e5217d8b6 100644
--- a/libethcore/EthashCUDAMiner.h
+++ b/libethcore/EthashCUDAMiner.h
@@ -28,10 +28,14 @@ along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 #include "EthashAux.h"
 #include "Miner.h"
 
+class ethash_cuda_miner;
+
 namespace dev
 {
 namespace eth
 {
+class EthashCUDAHook;
+
 	class EthashCUDAMiner : public GenericMiner<EthashProofOfWork>, Worker
 	{
 		friend class dev::eth::EthashCUDAHook;
diff --git a/libethcore/EthashGPUMiner.cpp b/libethcore/EthashGPUMiner.cpp
index aa6f4adda..e9376f854 100644
--- a/libethcore/EthashGPUMiner.cpp
+++ b/libethcore/EthashGPUMiner.cpp
@@ -27,6 +27,7 @@
 #include <thread>
 #include <chrono>
 #include <libethash-cl/ethash_cl_miner.h>
+
 using namespace std;
 using namespace dev;
 using namespace eth;
diff --git a/libethcore/EthashGPUMiner.h b/libethcore/EthashGPUMiner.h
index 49efd652b..6e39bb747 100644
--- a/libethcore/EthashGPUMiner.h
+++ b/libethcore/EthashGPUMiner.h
@@ -24,14 +24,17 @@
 #pragma once
 #if ETH_ETHASHCL
 
-#include "libdevcore/Worker.h"
+#include <libdevcore/Worker.h>
 #include "EthashAux.h"
 #include "Miner.h"
 
+class ethash_cl_miner;
+
 namespace dev
 {
 namespace eth
 {
+class EthashCLHook;
 
 class EthashGPUMiner: public GenericMiner<EthashProofOfWork>, Worker
 {