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-rw-r--r--revision.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/revision.c b/revision.c
index 6d9188b6cb..4d6f57b64e 100644
--- a/revision.c
+++ b/revision.c
@@ -720,7 +720,7 @@ void init_revisions(struct rev_info *revs, const char *prefix)
revs->commit_format = CMIT_FMT_DEFAULT;
diff_setup(&revs->diffopt);
- if (prefix) {
+ if (prefix && !revs->diffopt.prefix) {
revs->diffopt.prefix = prefix;
revs->diffopt.prefix_length = strlen(prefix);
}