diff --git a/blockchain.cpp b/blockchain.cpp
index ab01df5a5..15cda8037 100644
--- a/blockchain.cpp
+++ b/blockchain.cpp
@@ -192,7 +192,8 @@ void doBlockchainTests(json_spirit::mValue& _v, bool _fillin)
 					state.sync(bc, txs, gp);
 					state.commitToMine(bc);
 					MineInfo info;
-					for (info.completed = false; !info.completed; info = state.mine()) {}
+					ProofOfWork pow;
+					for (info.completed = false; !info.completed; info = state.mine(&pow)) {}
 					state.completeMine();
 				}
 				catch (Exception const& _e)
@@ -577,7 +578,7 @@ void overwriteBlockHeader(BlockInfo& _currentBlockHeader, mObject& _blObj)
 			std::pair<MineInfo, Ethash::Proof> ret;
 			while (!ProofOfWork::verify(_currentBlockHeader))
 			{
-				ret = pow.mine(_currentBlockHeader, 1000, true, true);
+				ret = pow.mine(_currentBlockHeader, 1000, true);
 				Ethash::assignResult(ret.second, _currentBlockHeader);
 			}
 		}
@@ -623,7 +624,7 @@ void updatePoW(BlockInfo& _bi)
 	std::pair<MineInfo, Ethash::Proof> ret;
 	while (!ProofOfWork::verify(_bi))
 	{
-		ret = pow.mine(_bi, 10000, true, true);
+		ret = pow.mine(_bi, 10000, true);
 		Ethash::assignResult(ret.second, _bi);
 	}
 	_bi.noteDirty();
diff --git a/stateOriginal.cpp b/stateOriginal.cpp
index 572e84dcf..40f759434 100644
--- a/stateOriginal.cpp
+++ b/stateOriginal.cpp
@@ -68,7 +68,8 @@ BOOST_AUTO_TEST_CASE(Complex)
 
 	// Mine to get some ether!
 	s.commitToMine(bc);
-	while (!s.mine(100, true).completed) {}
+	ProofOfWork pow;
+	while (!s.mine(&pow).completed) {}
 	s.completeMine();
 	bc.attemptImport(s.blockData(), stateDB);
 
@@ -88,7 +89,7 @@ BOOST_AUTO_TEST_CASE(Complex)
 	// Mine to get some ether and set in stone.
 	s.commitToMine(bc);
 	s.commitToMine(bc);
-	while (!s.mine(100, true).completed) {}
+	while (!s.mine(&pow).completed) {}
 	s.completeMine();
 	bc.attemptImport(s.blockData(), stateDB);
 
diff --git a/webthreestubclient.h b/webthreestubclient.h
index a460ddda4..c1fdc3411 100644
--- a/webthreestubclient.h
+++ b/webthreestubclient.h
@@ -72,6 +72,16 @@ class WebThreeStubClient : public jsonrpc::Client
             else
                 throw jsonrpc::JsonRpcException(jsonrpc::Errors::ERROR_CLIENT_INVALID_RESPONSE, result.toStyledString());
         }
+        std::string eth_hashrate() throw (jsonrpc::JsonRpcException)
+        {
+            Json::Value p;
+            p = Json::nullValue;
+            Json::Value result = this->CallMethod("eth_hashrate",p);
+            if (result.isString())
+                return result.asString();
+            else
+                throw jsonrpc::JsonRpcException(jsonrpc::Errors::ERROR_CLIENT_INVALID_RESPONSE, result.toStyledString());
+        }
         std::string eth_coinbase() throw (jsonrpc::JsonRpcException)
         {
             Json::Value p;