diff --git a/src/main.cpp b/src/main.cpp
index d92f528b74b..3c8a4a6d184 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1784,7 +1784,7 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
     pindexNew->bnChainTrust = (pindexNew->pprev ? pindexNew->pprev->bnChainTrust : 0) + pindexNew->GetBlockTrust();
 
     // ppcoin: compute stake entropy bit for stake modifier
-    if (!pindexNew->SetStakeEntropyBit(GetStakeEntropyBit()))
+    if (!pindexNew->SetStakeEntropyBit(GetStakeEntropyBit(pindexNew->nHeight)))
         return error("AddToBlockIndex() : SetStakeEntropyBit() failed");
 
     // ppcoin: record proof-of-stake hash value
diff --git a/src/main.h b/src/main.h
index 7e05562b2f9..e3f454f9ec3 100644
--- a/src/main.h
+++ b/src/main.h
@@ -966,8 +966,18 @@ class CBlock
     void UpdateTime(const CBlockIndex* pindexPrev);
 
     // ppcoin: entropy bit for stake modifier if chosen by modifier
-    unsigned int GetStakeEntropyBit() const
+    unsigned int GetStakeEntropyBit(unsigned int nHeight) const
     {
+        // Protocol switch to support p2pool at novacoin block #9689
+        if (nHeight >= 9689)
+        {
+            // Take last bit of block hash as entropy bit
+            unsigned int nEntropyBit = ((GetHash().Get64()) & 1llu);
+            if (fDebug && GetBoolArg("-printstakemodifier"))
+                printf("GetStakeEntropyBit: nHeight=%u hashBlock=%s nEntropyBit=%u\n", nHeight, GetHash().ToString().c_str(), nEntropyBit);
+            return nEntropyBit;
+        }
+        // Before novacoin block #9689 - old protocol
         uint160 hashSig = Hash160(vchBlockSig);
         if (fDebug && GetBoolArg("-printstakemodifier"))
             printf("GetStakeEntropyBit: hashSig=%s", hashSig.ToString().c_str());