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-rw-r--r--lib/hitomezashi_utils.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/hitomezashi_utils.c b/lib/hitomezashi_utils.c
index 32832de..93ec850 100644
--- a/lib/hitomezashi_utils.c
+++ b/lib/hitomezashi_utils.c
@@ -3,7 +3,7 @@
#include <stddef.h>
#include <stdlib.h>
-char *hitomezashi_ascii_binary_str_to_ints(char *ascii_str, size_t len) {
+char *hitomezashi_ascii_binary_str_to_ints(const char *ascii_str, size_t len) {
char *res = malloc(len);
for (int i = 0; i < len; ++i) {
switch (ascii_str[i]) {