diff --git a/ext/mysqlnd/mysqlnd_wireprotocol.c b/ext/mysqlnd/mysqlnd_wireprotocol.c
index dfdba4084e1..348b5640e4d 100644
--- a/ext/mysqlnd/mysqlnd_wireprotocol.c
+++ b/ext/mysqlnd/mysqlnd_wireprotocol.c
@@ -226,7 +226,7 @@ php_mysqlnd_net_store_length_size(uint64_t length)
 	if (length < (uint64_t) L64(16777216)) {
 		return 4;
 	}
-	return 8;
+	return 9;
 }
 /* }}} */