diff --git a/policyd_rate_limit/utils.py b/policyd_rate_limit/utils.py
index 664ae93..263815f 100644
--- a/policyd_rate_limit/utils.py
+++ b/policyd_rate_limit/utils.py
@@ -460,7 +460,7 @@ def database_init():
     """Initialize database (create the table and index)"""
     with cursor() as cur:
         query = """CREATE TABLE IF NOT EXISTS mail_count (
-      id varchar(40) NOT NULL,
+      id varchar(255) NOT NULL,
       date bigint NOT NULL,
       recipient_count int DEFAULT 1,
       instance varchar(40) NOT NULL,
@@ -481,7 +481,7 @@ def database_init():
 
         # if report is enable, also create the table for storing report datas
         query_report = """CREATE TABLE IF NOT EXISTS limit_report (
-      id varchar(40) NOT NULL,
+      id varchar(255) NOT NULL,
       delta int NOT NULL,
       hit int NOT NULL DEFAULT 0
     );"""