diff --git a/eth/common/headers.nim b/eth/common/headers.nim
index 1bc0096..b7ed5bc 100644
--- a/eth/common/headers.nim
+++ b/eth/common/headers.nim
@@ -39,6 +39,7 @@ type
     excessBlobGas*:   Opt[uint64]       # EIP-4844
     parentBeaconBlockRoot*: Opt[Hash32] # EIP-4788
     requestsHash*:    Opt[Hash32]       # EIP-7685
+    targetBlobCount*: Opt[uint64]       # EIP-7742
 
 # starting from EIP-4399, `mixDigest` field is called `prevRandao`
 template prevRandao*(h: Header): Bytes32 =