diff --git a/core/types/block.go b/core/types/block.go
index d3b0070026..b8f0c94f2a 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -92,7 +92,7 @@ type Header struct {
 	ExcessBlobGas *uint64 `json:"excessBlobGas" rlp:"optional"`
 
 	// BeaconRoot was added by EIP-4788 and is ignored in legacy headers.
-	BeaconRoot *common.Hash `json:"beaconRoot" rlp:"optional"`
+	BeaconRoot *common.Hash `json:"parentBeaconBlockRoot" rlp:"optional"`
 }
 
 // field type overrides for gencodec