diff --git a/cmd/utils/cmd.go b/cmd/utils/cmd.go
index 2891e66fbb..de5918a722 100644
--- a/cmd/utils/cmd.go
+++ b/cmd/utils/cmd.go
@@ -450,7 +450,7 @@ func ExportHistory(bc *core.BlockChain, dir string, first, last, step uint64) er
 					return fmt.Errorf("export failed on #%d: receipts not found", n)
 				}
 				td.Add(td, block.Difficulty())
-				if err := w.Add(block, receipts, td); err != nil {
+				if err := w.Add(block, receipts, new(big.Int).Set(td)); err != nil {
 					return err
 				}
 			}
diff --git a/core/tracing/hooks.go b/core/tracing/hooks.go
index 4343edfe86..da364444ed 100644
--- a/core/tracing/hooks.go
+++ b/core/tracing/hooks.go
@@ -63,7 +63,6 @@ type VMContext struct {
 // It contains the block as well as consensus related information.
 type BlockEvent struct {
 	Block     *types.Block
-	TD        *big.Int
 	Finalized *types.Header
 	Safe      *types.Header
 }