diff --git a/CHANGELOG b/CHANGELOG
index 65c86e116b..92665e3e8d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Prevent to change the type of journal with posted moves
 * Mute reconciled payable/receivable lines
 * Add delegated amount on move lines
 * Enforce same type for children account as their parent
diff --git a/journal.py b/journal.py
index 1a3a582927..5af1c96d98 100644
--- a/journal.py
+++ b/journal.py
@@ -151,6 +151,25 @@ class Journal(
                     debit - credit)
         return result
 
+    @classmethod
+    def write(cls, *args):
+        pool = Pool()
+        Move = pool.get('account.move')
+        actions = iter(args)
+        for journals, values in zip(actions, actions):
+            if 'type' in values:
+                for sub_journals in grouped_slice(journals):
+                    moves = Move.search([
+                            ('journal', 'in', [j.id for j in sub_journals]),
+                            ('state', '=', 'posted')
+                            ], order=[], limit=1)
+                    if moves:
+                        move, = moves
+                        raise AccessError(gettext(
+                                'account.msg_journal_account_moves',
+                                journal=move.journal.rec_name))
+        super().write(*args)
+
 
 class JournalSequence(ModelSQL, CompanyValueMixin):
     "Journal Sequence"
diff --git a/message.xml b/message.xml
index da6c47bc71..28dc059e48 100644
--- a/message.xml
+++ b/message.xml
@@ -234,5 +234,8 @@ You may need to cancel its move "%(move)s".</field>
         <record model="ir.message" id="msg_close_period_inactive_accounts">
             <field name="text">To close period "%(period)s", you must balance the inactive account "%(account)s".</field>
         </record>
+        <record model="ir.message" id="msg_journal_account_moves">
+            <field name="text">You cannot change the type of journal "%(journal)s" because it has posted moves.</field>
+        </record>
     </data>
 </tryton>