diff --git a/core/blockchain.go b/core/blockchain.go
index 96dd454745..5fe2d5390d 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -2442,26 +2442,6 @@ func (bc *BlockChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (i
 	return bc.hc.InsertHeaderChain(chain, whFunc, start)
 }
 
-// writeHeader writes a header into the local chain, given that its parent is
-// already known. If the total difficulty of the newly inserted header becomes
-// greater than the current known TD, the canonical chain is re-routed.
-//
-// Note: This method is not concurrent-safe with inserting blocks simultaneously
-// into the chain, as side effects caused by reorganisations cannot be emulated
-// without the real blocks. Hence, writing headers directly should only be done
-// in two scenarios: pure-header mode of operation (light clients), or properly
-// separated header/block phases (non-archive clients).
-func (bc *BlockChain) writeHeader(header *types.Header) error {
-	bc.wg.Add(1)
-	defer bc.wg.Done()
-
-	bc.mu.Lock()
-	defer bc.mu.Unlock()
-
-	_, err := bc.hc.WriteHeader(header)
-	return err
-}
-
 // CurrentHeader retrieves the current head header of the canonical chain. The
 // header is retrieved from the HeaderChain's internal cache.
 func (bc *BlockChain) CurrentHeader() *types.Header {