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-rw-r--r--parse-options.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/parse-options.h b/parse-options.h
index 05bf824..fece5ba 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -281,7 +281,7 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
int parse_options_end(struct parse_opt_ctx_t *ctx);
struct option *parse_options_dup(const struct option *a);
-struct option *parse_options_concat(struct option *a, struct option *b);
+struct option *parse_options_concat(const struct option *a, const struct option *b);
/*----- some often used options -----*/
int parse_opt_abbrev_cb(const struct option *, const char *, int);