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-rw-r--r--builtin-diff.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/builtin-diff.c b/builtin-diff.c
index d5fe775fc1..35da366f46 100644
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -74,6 +74,8 @@ static int builtin_diff_b_f(struct rev_info *revs,
if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)))
die("'%s': not a regular file or symlink", path);
+ diff_set_mnemonic_prefix(&revs->diffopt, "o/", "w/");
+
if (blob[0].mode == S_IFINVALID)
blob[0].mode = canon_mode(st.st_mode);