diff --git a/core/error.go b/core/error.go
index de95e64636..e50780bf1b 100644
--- a/core/error.go
+++ b/core/error.go
@@ -28,6 +28,10 @@ var (
 
 	// ErrNoGenesis is returned when there is no Genesis Block.
 	ErrNoGenesis = errors.New("genesis not found in chain")
+
+	// ErrBlockOversized is returned if the size of the RLP-encoded block
+	// exceeds the cap established by EIP 7934
+	ErrBlockOversized = errors.New("block RLP-encoded size exceeds maximum")
 )
 
 // List of evm-call-message pre-checking errors. All state transition messages will