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-rw-r--r--diff.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/diff.c b/diff.c
index 9a5c77c13f..0e2e872e0b 100644
--- a/diff.c
+++ b/diff.c
@@ -3310,7 +3310,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
else if ((argcount = parse_long_opt("output", av, &optarg))) {
options->file = fopen(optarg, "w");
if (!options->file)
- die_errno("Could not open '%s'", arg + strlen("--output="));
+ die_errno("Could not open '%s'", optarg);
options->close_file = 1;
return argcount;
} else