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-rw-r--r--builtin/worktree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin/worktree.c b/builtin/worktree.c
index e866844685..cce555cbbc 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -262,7 +262,7 @@ static int add_worktree(const char *path, const char *refname,
*/
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
- write_file(sb.buf, sha1_to_hex(null_sha1));
+ write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
write_file(sb.buf, "../..");