diff --git a/libethcore/BlockInfo.h b/libethcore/BlockInfo.h
index adddf0f3c..93ffac14c 100644
--- a/libethcore/BlockInfo.h
+++ b/libethcore/BlockInfo.h
@@ -188,8 +188,6 @@ template <class BlockInfoSub>
 class BlockHeaderPolished: public BlockInfoSub
 {
 public:
-	static const unsigned Fields = BlockInfoSub::BasicFields + BlockInfoSub::SealFields;
-
 	BlockHeaderPolished() {}
 	BlockHeaderPolished(BlockInfo const& _bi): BlockInfoSub(_bi) {}
 	explicit BlockHeaderPolished(bytes const& _data, Strictness _s = IgnoreSeal, h256 const& _h = h256(), BlockDataType _bdt = BlockData) { populate(&_data, _s, _h, _bdt); }
diff --git a/libethcore/EthashGPUMiner.cpp b/libethcore/EthashGPUMiner.cpp
index 9f2c7b2ba..aa6f4adda 100644
--- a/libethcore/EthashGPUMiner.cpp
+++ b/libethcore/EthashGPUMiner.cpp
@@ -183,7 +183,7 @@ void EthashGPUMiner::workLoop()
 		}
 
 		uint64_t upper64OfBoundary = (uint64_t)(u64)((u256)w.boundary >> 192);
-		uint64_t startN;
+		uint64_t startN = 0;
 		if (w.exSizeBits >= 0)
 			startN = w.startNonce | ((uint64_t)index() << (64 - 4 - w.exSizeBits)); // this can support up to 16 devices
 		m_miner->search(w.headerHash.data(), upper64OfBoundary, *m_hook, (w.exSizeBits >= 0), startN);