diff --git a/addons/account_voucher/test/case1_usd_usd.yml b/addons/account_voucher/test/case1_usd_usd.yml
index d8ac932a055..a30c85ffb71 100644
--- a/addons/account_voucher/test/case1_usd_usd.yml
+++ b/addons/account_voucher/test/case1_usd_usd.yml
@@ -173,12 +173,12 @@
         self.pool.get('account.voucher.line').write(cr, uid, [line_id], {'amount': amount})
     assert (voucher_id.state=='draft'), "Voucher is not in draft state"
 -
-  I check that writeoff amount computed is 10.0
+  I check that writeoff amount computed is -10.0
 -
   !python {model: account.voucher}: |
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 1 USD/USD'), ('partner_id', '=', ref('base.res_partner_seagate'))])
     voucher_id = self.browse(cr, uid, voucher[0])
-    assert (voucher_id.writeoff_amount == 10.0), "Writeoff amount is not 10.0"
+    assert (voucher_id.writeoff_amount == -10.0), "Writeoff amount is not -10.0"
 -
   I confirm the voucher
 -
@@ -266,12 +266,12 @@
         self.pool.get('account.voucher.line').write(cr, uid, [line_id], {'amount': amount})
     assert (voucher_id.state=='draft'), "Voucher is not in draft state"
 -
-  I check that writeoff amount computed is 5.0
+  I check that writeoff amount computed is -5.0
 -
   !python {model: account.voucher}: |
     voucher = self.search(cr, uid, [('name', '=', 'Second payment: Case 1'), ('partner_id', '=', ref('base.res_partner_seagate'))])
     voucher_id = self.browse(cr, uid, voucher[0])
-    assert (voucher_id.writeoff_amount == 5.0), "Writeoff amount is not 5.0"
+    assert (voucher_id.writeoff_amount == -5.0), "Writeoff amount is not -5.0"
 -
   I confirm the voucher
 -
diff --git a/addons/account_voucher/test/case_eur_usd.yml b/addons/account_voucher/test/case_eur_usd.yml
index 72f0d22aead..53db4ffaf80 100644
--- a/addons/account_voucher/test/case_eur_usd.yml
+++ b/addons/account_voucher/test/case_eur_usd.yml
@@ -107,11 +107,11 @@
         self.pool.get('account.voucher.line').write(cr, uid, [line_id], {'amount': amount})
     assert (voucher.state=='draft'), "Voucher is not in draft state"
 -
-  I check that writeoff amount computed is 50.0
+  I check that writeoff amount computed is -50.0
 -
   !python {model: account.voucher}: |
     voucher = self.browse(cr, uid, ref('account_voucher_eur_usd_case'))
-    assert (voucher.writeoff_amount == 50.0), "Writeoff amount is not 50.0"
+    assert (voucher.writeoff_amount == -50.0), "Writeoff amount is not -50.0"
 -
   I confirm the voucher
 -
@@ -167,4 +167,4 @@
     move_lines = move_line_obj.search(cr, uid, [('move_id', '=', invoice_id.move_id.id), ('invoice', '=', invoice_id.id), ('account_id', '=', invoice_id.account_id.id)])
     move_line = move_line_obj.browse(cr, uid, move_lines[0])
     assert (move_line.amount_residual_currency == 0.0 and move_line.amount_residual == 0.0 and invoice_id.state == 'paid') , "Residual amount is not correct for Invoice"
-    
\ No newline at end of file
+