diff --git a/htdocs/install/mysql/migration/6.0.0-7.0.0.sql b/htdocs/install/mysql/migration/6.0.0-7.0.0.sql
index 9bc56f4ebf1..befa29e03ae 100644
--- a/htdocs/install/mysql/migration/6.0.0-7.0.0.sql
+++ b/htdocs/install/mysql/migration/6.0.0-7.0.0.sql
@@ -25,6 +25,12 @@
 -- -- VMYSQL4.1 DELETE FROM llx_usergroup_user      WHERE fk_usergroup NOT IN (SELECT rowid from llx_usergroup);
 
 
+-- Drop old key with old name
+ALTER TABLE llx_accounting_account DROP FOREIGN KEY fk_accountingaccount_fk_pcg_version;
+
+-- Drop foreign key, so next alter will be a success
+-- VMYSQLUTF8UNICODECI ALTER TABLE llx_accounting_account DROP FOREIGN KEY fk_accounting_account_fk_pcg_version;
+
 -- VMYSQLUTF8UNICODECI ALTER TABLE llx_accounting_account MODIFY fk_pcg_version VARCHAR(20) CHARACTER SET utf8;
 -- VMYSQLUTF8UNICODECI ALTER TABLE llx_accounting_account MODIFY fk_pcg_version VARCHAR(20) COLLATE utf8_unicode_ci;
 -- VMYSQLUTF8UNICODECI ALTER TABLE llx_accounting_system MODIFY pcg_version VARCHAR(20) CHARACTER SET utf8;
@@ -52,6 +58,10 @@
 -- VMYSQLUTF8UNICODECI ALTER TABLE llx_c_type_fees MODIFY accountancy_code VARCHAR(32) CHARACTER SET utf8;
 -- VMYSQLUTF8UNICODECI ALTER TABLE llx_c_type_fees MODIFY accountancy_code VARCHAR(32) COLLATE utf8_unicode_ci;
 
+-- Restore dropped foreign key
+-- VMYSQLUTF8UNICODECI ALTER TABLE llx_accounting_account ADD CONSTRAINT fk_accounting_account_fk_pcg_version FOREIGN KEY (fk_pcg_version) REFERENCES llx_accounting_system (pcg_version);
+
+
 
 -- Missing in 5.0
 ALTER TABLE llx_user MODIFY login varchar(50) NOT NULL;