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-rw-r--r--read-cache.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/read-cache.c b/read-cache.c
index 77961a3885..a80902155c 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2236,7 +2236,8 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
mmap = xmmap_gently(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (mmap == MAP_FAILED)
- die_errno(_("%s: unable to map index file"), path);
+ die_errno(_("%s: unable to map index file%s"), path,
+ mmap_os_err());
close(fd);
hdr = (const struct cache_header *)mmap;