diff --git a/json_tokener.h b/json_tokener.h
index 162a152..7e2687f 100644
--- a/json_tokener.h
+++ b/json_tokener.h
@@ -77,7 +77,7 @@ struct json_tokener
   struct printbuf *pb;
   int depth, is_double, st_pos, char_offset;
   enum json_tokener_error err;
-  unsigned int ucs_char;
+  unsigned int32_t ucs_char;
   char quote_char;
   struct json_tokener_srec stack[JSON_TOKENER_MAX_DEPTH];
 };