@@ -378,14 +378,9 @@ tok_reserve_buf(struct tok_state *tok, Py_ssize_t size)
     return 1;
 }
 
-static int
+static inline int
 contains_null_bytes(const char* str, size_t size) {
-    for (size_t i =0; i < size; i++) {
-        if (str[i] == '\0') {
-            return 1;
-        }
-    }
-    return 0;
+    return memchr(str, 0, size) != NULL;
 }
 
 static int