1 files changed, 1 insertions, 1 deletions
diff --git a/common.h b/common.h
index f3dc8de..01d3231 100644
--- a/common.h
+++ b/common.h
@@ -63,7 +63,7 @@ struct testcase {
 };
 
 static void
-hex(char *out, const unsigned char *in, size_t n)
+hex(char *restrict out, const unsigned char *restrict in, size_t n)
 {
         for (; n--; in++) {
                 *out++ = "0123456789abcdef"[(*in >> 4) & 15];