diff --git a/libdevcore/RLP.h b/libdevcore/RLP.h
index 7d223f73a..248a2e645 100644
--- a/libdevcore/RLP.h
+++ b/libdevcore/RLP.h
@@ -289,7 +289,7 @@ public:
 
 private:
 	/// Disable construction from rvalue
-	explicit RLP(bytes const&& _d) {}
+	explicit RLP(bytes const&&) {}
 
 	/// Single-byte data payload.
 	bool isSingleByte() const { return !isNull() && m_data[0] < c_rlpDataImmLenStart; }
diff --git a/third/MainWin.cpp b/third/MainWin.cpp
index 10f07ef6a..f86dc0434 100644
--- a/third/MainWin.cpp
+++ b/third/MainWin.cpp
@@ -84,9 +84,10 @@ Main::Main(QWidget *parent) :
 	ui->setupUi(this);
 
     cerr << "State root: " << BlockChain::genesis().stateRoot << endl;
-    cerr << "Block Hash: " << sha3(BlockChain::createGenesisBlock()) << endl;
-    cerr << "Block RLP: " << RLP(BlockChain::createGenesisBlock()) << endl;
-    cerr << "Block Hex: " << toHex(BlockChain::createGenesisBlock()) << endl;
+	auto gb = BlockChain::createGenesisBlock();
+	cerr << "Block Hash: " << sha3(gb) << endl;
+	cerr << "Block RLP: " << RLP(gb) << endl;
+	cerr << "Block Hex: " << toHex(gb) << endl;
 	cerr << "Network protocol version: " << dev::eth::c_protocolVersion << endl;
 	cerr << "Client database version: " << dev::eth::c_databaseVersion << endl;