1 files changed, 2 insertions, 1 deletions
diff --git a/src/pow.h b/src/pow.h
index 89b219f808..3337a30a5e 100644
--- a/src/pow.h
+++ b/src/pow.h
@@ -11,11 +11,12 @@
 class CBlockHeader;
 class CBlockIndex;
 class uint256;
+class arith_uint256;
 
 unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock);
 
 /** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
-uint256 GetBlockProof(const CBlockIndex& block);
+arith_uint256 GetBlockProof(const CBlockIndex& block);
 
 #endif // BITCOIN_POW_H