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-rw-r--r--simple-opt.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/simple-opt.h b/simple-opt.h
index d250e73..ada6233 100644
--- a/simple-opt.h
+++ b/simple-opt.h
@@ -660,7 +660,7 @@ static void simple_opt_print_usage(FILE *f, unsigned width, char *usage_name,
if (options[i].type != SIMPLE_OPT_FLAG) {
if (options[i].custom_arg_string != NULL) {
sprintf(print_buffer + print_buffer_offset,
- options[i].custom_arg_string);
+ "%s", options[i].custom_arg_string);
print_buffer_offset += strlen(options[i].custom_arg_string);
} else {
switch (options[i].type) {