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-rw-r--r--builtin-diff-index.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/builtin-diff-index.c b/builtin-diff-index.c
index 95a3db156b..083599d5c4 100644
--- a/builtin-diff-index.c
+++ b/builtin-diff-index.c
@@ -38,5 +38,9 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
if (rev.pending.nr != 1 ||
rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
usage(diff_cache_usage);
+ if (read_cache() < 0) {
+ perror("read_cache");
+ return -1;
+ }
return run_diff_index(&rev, cached);
}