diff --git a/convert.py b/convert.py
index da54fa9b73b9c5195c947387b9438adfb572a6c5..ff8efa36a6c810dbaef870045b0dfb9d8a279ff9 100644
--- a/convert.py
+++ b/convert.py
@@ -86,10 +86,10 @@ def write_header(file):
     file.write("DROP TABLE IF EXISTS `store`;\n")
     file.write(
 """CREATE TABLE `store` (
-    `key` varchar(100) COLLATE utf8_bin NOT NULL DEFAULT '',
-    `value` longtext COLLATE utf8_bin NOT NULL,
+    `key` varchar(100) COLLATE utf8mb4_bin NOT NULL DEFAULT '',
+    `value` longtext COLLATE utf8mb4_bin NOT NULL,
     PRIMARY KEY (`key`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
 """)
     file.write("LOCK TABLES `store` WRITE;\n")