1 files changed, 1 insertions, 1 deletions

diff --git a/xs_json.h b/xs_json.h
index c171172..6af47a2 100644
--- a/xs_json.h
+++ b/xs_json.h
@@ -40,7 +40,7 @@ static xs_str *_xs_json_dumps_str(xs_str *s, const char *data)
         if (c < 32) {
             char tmp[10];
 
-            sprintf(tmp, "\\u%04x", (unsigned int) c);
+            snprintf(tmp, sizeof(tmp), "\\u%04x", (unsigned int) c);
             s = xs_str_cat(s, tmp);
         }
         else