diff --git a/eth/backend.go b/eth/backend.go
index 939501cfb3..54b8c2e75d 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -211,6 +211,10 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	}
 	eth.engine.VerifyHeader(eth.blockchain, eth.blockchain.CurrentHeader(), true) // TODO think on it
 
+	// BOR changes
+	eth.APIBackend.gpo.ProcessCache()
+	// BOR changes
+
 	// Rewind the chain in case of an incompatible config upgrade.
 	if compat, ok := genesisErr.(*params.ConfigCompatError); ok {
 		log.Warn("Rewinding chain to upgrade configuration", "err", compat)
diff --git a/eth/gasprice/gasprice.go b/eth/gasprice/gasprice.go
index 8feb5ef24b..0fa6c29591 100644
--- a/eth/gasprice/gasprice.go
+++ b/eth/gasprice/gasprice.go
@@ -106,17 +106,6 @@ func NewOracle(backend OracleBackend, params Config) *Oracle {
 	}
 
 	cache, _ := lru.New(2048)
-	headEvent := make(chan core.ChainHeadEvent, 1)
-	backend.SubscribeChainHeadEvent(headEvent)
-	go func() {
-		var lastHead common.Hash
-		for ev := range headEvent {
-			if ev.Block.ParentHash() != lastHead {
-				cache.Purge()
-			}
-			lastHead = ev.Block.Hash()
-		}
-	}()
 
 	return &Oracle{
 		backend:          backend,
@@ -131,6 +120,20 @@ func NewOracle(backend OracleBackend, params Config) *Oracle {
 	}
 }
 
+func (oracle *Oracle) ProcessCache() {
+	headEvent := make(chan core.ChainHeadEvent, 1)
+	oracle.backend.SubscribeChainHeadEvent(headEvent)
+	go func() {
+		var lastHead common.Hash
+		for ev := range headEvent {
+			if ev.Block.ParentHash() != lastHead {
+				oracle.historyCache.Purge()
+			}
+			lastHead = ev.Block.Hash()
+		}
+	}()
+}
+
 // SuggestTipCap returns a tip cap so that newly created transaction can have a
 // very high chance to be included in the following blocks.
 //