diff --git a/src/pow.cpp b/src/pow.cpp
index 038f130e8..0a37dc8fb 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -74,7 +74,7 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
     // Find the first block in the averaging interval
     const CBlockIndex* pindexFirst = pindexLast;
     arith_uint256 bnTarget,bnTot {0};
-    uint32_t nbits; int64_t diff,mult = 0;
+    uint32_t nbits; int32_t diff,mult = 0;
     if ( pindexFirst != 0 && pblock != 0 )
     {
         mult = pblock->nTime - pindexFirst->nTime - 7 * ASSETCHAINS_BLOCKTIME;