diff --git a/plugins/calendar/drivers/database/SQL/mysql.initial.sql b/plugins/calendar/drivers/database/SQL/mysql.initial.sql
index c8c3d7bf..ac58f7f5 100644
--- a/plugins/calendar/drivers/database/SQL/mysql.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/mysql.initial.sql
@@ -79,4 +79,4 @@ CREATE TABLE `itipinvitations` (
     REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
 ) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */;
 
-INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013011000.sql');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013011000');
diff --git a/plugins/calendar/drivers/database/SQL/postgres.initial.sql b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
index e3ba4978..5dfd9525 100644
--- a/plugins/calendar/drivers/database/SQL/postgres.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
@@ -103,4 +103,4 @@ CREATE TABLE itipinvitations (
 
 CREATE INDEX itipinvitations_user_id_event_uid_idx ON itipinvitations (user_id, event_uid);
 
-INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013011000.sql');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013011000');
diff --git a/plugins/calendar/drivers/database/SQL/sqlite.initial.sql b/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
index 67ce8ad0..778b0bff 100644
--- a/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
@@ -73,4 +73,4 @@ CREATE TABLE itipinvitations (
 
 CREATE INDEX ix_itipinvitations_uid ON itipinvitations(user_id, event_uid);
 
-INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013011000.sql');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013011000');
diff --git a/plugins/calendar/drivers/kolab/SQL/mysql.initial.sql b/plugins/calendar/drivers/kolab/SQL/mysql.initial.sql
index 9c904330..00032baf 100644
--- a/plugins/calendar/drivers/kolab/SQL/mysql.initial.sql
+++ b/plugins/calendar/drivers/kolab/SQL/mysql.initial.sql
@@ -29,4 +29,4 @@ CREATE TABLE IF NOT EXISTS `itipinvitations` (
     REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
 ) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */;
 
-INSERT INTO system (name, value) VALUES ('calendar-kolab-version', '2013011000.sql');
+INSERT INTO system (name, value) VALUES ('calendar-kolab-version', '2013011000');