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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 adb93a9efa..c47614d7c2 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -162,6 +162,8 @@ static int builtin_diff_tree(struct rev_info *revs,
if (argc > 1)
usage(builtin_diff_usage);
+ enforce_no_complete_ignore_submodule(&revs->diffopt);
+
/*
* We saw two trees, ent0 and ent1. If ent1 is uninteresting,
* swap them.