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-rw-r--r--payload_consumer/delta_performer.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index d384e456..4ac0c494 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -273,6 +273,7 @@ size_t DeltaPerformer::CopyDataToBuffer(const char** bytes_p, size_t* count_p,
size_t read_len = min(count, max - buffer_.size());
const char* bytes_start = *bytes_p;
const char* bytes_end = bytes_start + read_len;
+ buffer_.reserve(max);
buffer_.insert(buffer_.end(), bytes_start, bytes_end);
*bytes_p = bytes_end;
*count_p = count - read_len;