diff --git a/db/write_batch.cc b/db/write_batch.cc
index fa01e82db1..c04930bbf1 100644
--- a/db/write_batch.cc
+++ b/db/write_batch.cc
@@ -58,6 +58,7 @@ bool WriteBatch::Handler::Continue() {
 
 void WriteBatch::Clear() {
   rep_.clear();
+  rep_.resize(kHeader);
 }
 
 int WriteBatch::Count() const {