diff --git a/src/chain.cpp b/src/chain.cpp
index 10ab58c69d..50e3c2ca3d 100644
--- a/src/chain.cpp
+++ b/src/chain.cpp
@@ -145,15 +145,18 @@ int64_t CBlockIndex::GetBlockWork() const
     if (pprev && pprev->pprev)
         nTimeSpan = pprev->GetBlockTime() - pprev->pprev->GetBlockTime();
     int64_t nBlockWork = 1000 - nTimeSpan;
-    if (nBlockWork <= 0)
-        nBlockWork = 1;
 
     //PoS blocks have the final decision on consensus, if it is between a PoW block and PoS block
     // PoS blocks are also the only type of block that has the scoring of the block directly based on the elapsed time
     // of this block and the prev. PoW is not bound by timestamps the same way PoS is, so it is not as safe to do with PoW
     if (IsProofOfStake()) {
-        nBlockWork += 1000 + (GetBlockTime() - pprev->GetBlockTime());
+        nTimeSpan = GetBlockTime() - pprev->GetBlockTime();
+        if (nTimeSpan < 0)
+            nTimeSpan = 1;
+        nBlockWork += (1000 - nTimeSpan);
     }
+    if (nBlockWork <= 0)
+        nBlockWork = 1;
     return nBlockWork;
 }