diff --git a/src/pow.cpp b/src/pow.cpp
index e1b57f042..3d616dc42 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -166,7 +166,7 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
         }
         else if ( block12diff != 0 && block7diff != 0 && block4diff != 0 )
         {
-            if ( block4diff > 4 && block4diff < ASSETCHAINS_BLOCKTIME ) // for 10x and higher hashrate increases
+            if ( block4diff > 4 && block4diff < ASSETCHAINS_BLOCKTIME/2 ) // for 10x and higher hashrate increases
             {
                 block4diff += (2 * ASSETCHAINS_BLOCKTIME) / 3;
                 bnTarget = bnTarget * arith_uint256(block4diff) / arith_uint256(ASSETCHAINS_BLOCKTIME * 2);