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-rw-r--r--revision.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/revision.c b/revision.c
index fda405bf65..599b3a66c3 100644
--- a/revision.c
+++ b/revision.c
@@ -3129,6 +3129,8 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
if (want_ancestry(revs))
revs->limited = 1;
revs->topo_order = 1;
+ if (!revs->diffopt.output_format)
+ revs->diffopt.output_format = DIFF_FORMAT_PATCH;
}
if (revs->topo_order && !generation_numbers_enabled(the_repository))