diff --git a/params/protocol_params.go b/params/protocol_params.go
index a11367a7ed..2cfed776e4 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -180,7 +180,7 @@ const (
 	HistoryServeWindow = 8192 // Number of blocks to serve historical block hashes for, EIP-2935.
 
 	WithdrawalSize  = 23        // size of a withdrawal
-	BlockRLPSizeCap = 9_961_472 // maximum size of an RLP-encoded block
+	BlockRLPSizeCap = 8_388_608 // maximum size of an RLP-encoded block
 )
 
 // Bls12381G1MultiExpDiscountTable is the gas discount table for BLS12-381 G1 multi exponentiation operation