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-rw-r--r--diff-tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/diff-tree.c b/diff-tree.c
index efa2b9476..efa17d14a 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -84,7 +84,7 @@ static const char *generate_header(const unsigned char *commit_sha1,
diff_unique_abbrev(parent_sha1, abbrev) : "root");
offset += pretty_print_commit(commit_format, msg, len,
this_header + offset,
- sizeof(this_header) - offset);
+ sizeof(this_header) - offset, abbrev);
return this_header;
}