diff --git a/core/block_validator.go b/core/block_validator.go
index 73c33d8dde..76a6fcdd0d 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -175,7 +175,7 @@ func (v *BlockValidator) VerifyUncles(block, parent *types.Block) error {
 			return UncleError("uncle[%d](%x)'s parent is not ancestor (%x)", i, hash[:4], uncle.ParentHash[0:4])
 		}
 
-		if err := ValidateHeader(v.Pow, uncle, ancestors[uncle.ParentHash].Header(), true, true); err != nil {
+		if err := ValidateHeader(v.Pow, uncle, ancestors[uncle.ParentHash].Header(), false, true); err != nil {
 			return ValidationError(fmt.Sprintf("uncle[%d](%x) header invalid: %v", i, hash[:4], err))
 		}
 	}