diff --git a/core/chain_makers.go b/core/chain_makers.go
index ae9f695328..dbd95026b3 100644
--- a/core/chain_makers.go
+++ b/core/chain_makers.go
@@ -22,7 +22,6 @@ import (
 
 	"github.com/ubiq/go-ubiq/common"
 	"github.com/ubiq/go-ubiq/consensus"
-	"github.com/ubiq/go-ubiq/consensus/misc"
 	"github.com/ubiq/go-ubiq/core/state"
 	"github.com/ubiq/go-ubiq/core/types"
 	"github.com/ubiq/go-ubiq/core/vm"
@@ -269,3 +268,4 @@ func (cr *fakeChainReader) GetHeaderByNumber(number uint64) *types.Header
 func (cr *fakeChainReader) GetHeaderByHash(hash common.Hash) *types.Header          { return nil }
 func (cr *fakeChainReader) GetHeader(hash common.Hash, number uint64) *types.Header { return nil }
 func (cr *fakeChainReader) GetBlock(hash common.Hash, number uint64) *types.Block   { return nil }
+func (cr *fakeChainReader) CalcPastMedianTime(number uint64, parent *types.Header) *big.Int { return nil }
diff --git a/core/state_processor.go b/core/state_processor.go
index 3dc81e4e6e..e9369b58c3 100644
--- a/core/state_processor.go
+++ b/core/state_processor.go
@@ -19,7 +19,6 @@ package core
 import (
 	"github.com/ubiq/go-ubiq/common"
 	"github.com/ubiq/go-ubiq/consensus"
-	"github.com/ubiq/go-ubiq/consensus/misc"
 	"github.com/ubiq/go-ubiq/core/state"
 	"github.com/ubiq/go-ubiq/core/types"
 	"github.com/ubiq/go-ubiq/core/vm"