1 files changed, 2 insertions, 1 deletions
diff --git a/config.c b/config.c
index 3cd10ae..55313fc 100644
--- a/config.c
+++ b/config.c
@@ -3052,7 +3052,8 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 		if (contents == MAP_FAILED) {
 			if (errno == ENODEV && S_ISDIR(st.st_mode))
 				errno = EISDIR;
-			error_errno(_("unable to mmap '%s'"), config_filename);
+			error_errno(_("unable to mmap '%s'%s"),
+					config_filename, mmap_os_err());
 			ret = CONFIG_INVALID_FILE;
 			contents = NULL;
 			goto out_free;