diff --git a/addons/account/models/partner.py b/addons/account/models/partner.py
index 86883ea36fd..0c7c5705b8e 100644
--- a/addons/account/models/partner.py
+++ b/addons/account/models/partner.py
@@ -248,7 +248,7 @@ class ResPartner(models.Model):
                       LEFT JOIN account_account_type act ON (a.user_type_id=act.id)
                       WHERE act.type IN ('receivable','payable')
                       AND account_move_line.partner_id IN %s
-                      AND account_move_line.reconciled IS FALSE
+                      AND account_move_line.reconciled IS NOT TRUE
                       """ + where_clause + """
                       GROUP BY account_move_line.partner_id, act.type
                       """, where_params)
diff --git a/addons/gamification/models/challenge.py b/addons/gamification/models/challenge.py
index 93efdef0d9b..b2f9289303e 100644
--- a/addons/gamification/models/challenge.py
+++ b/addons/gamification/models/challenge.py
@@ -251,7 +251,7 @@ class Challenge(models.Model):
                          AND gg.user_id = ru.id
                          AND ru.id = log.create_uid
                          AND gg.write_date < log.create_date
-                         AND gg.closed IS false
+                         AND gg.closed IS NOT TRUE
                          AND gc.id IN %s
                          AND (gg.state = 'inprogress'
                               OR (gg.state = 'reached'
diff --git a/addons/l10n_fr_fec/wizard/account_fr_fec.py b/addons/l10n_fr_fec/wizard/account_fr_fec.py
index 0484c10ce1c..497a716109c 100644
--- a/addons/l10n_fr_fec/wizard/account_fr_fec.py
+++ b/addons/l10n_fr_fec/wizard/account_fr_fec.py
@@ -57,7 +57,7 @@ class AccountFrFec(models.TransientModel):
         WHERE
             am.date < %s
             AND am.company_id = %s
-            AND aat.include_initial_balance = 'f'
+            AND aat.include_initial_balance IS NOT TRUE
             AND (aml.debit != 0 OR aml.credit != 0)
         '''
         # For official report: only use posted entries
diff --git a/addons/sale_timesheet/models/project.py b/addons/sale_timesheet/models/project.py
index 87a56b3ecac..77af2fcb7be 100644
--- a/addons/sale_timesheet/models/project.py
+++ b/addons/sale_timesheet/models/project.py
@@ -50,11 +50,12 @@ class Project(models.Model):
         ('timesheet_product_required_if_billable_and_timesheets', """
             CHECK(
                 (allow_billable = 't' AND allow_timesheets = 't' AND timesheet_product_id IS NOT NULL)
-                OR (allow_billable = 'f')
-                OR (allow_timesheets = 'f')
+                OR (allow_billable IS NOT TRUE)
+                OR (allow_timesheets IS NOT TRUE)
                 OR (allow_billable IS NULL)
                 OR (allow_timesheets IS NULL)
             )""", 'The timesheet product is required when the task can be billed and timesheets are allowed.'),
+
     ]
 
     @api.depends('billable_type', 'allow_billable', 'sale_order_id', 'partner_id')
diff --git a/addons/survey/models/survey_user.py b/addons/survey/models/survey_user.py
index bab1fd5165a..a9a8bc57b9f 100644
--- a/addons/survey/models/survey_user.py
+++ b/addons/survey/models/survey_user.py
@@ -126,7 +126,7 @@ class SurveyUserInput(models.Model):
                 LEFT OUTER JOIN survey_user_input previous_user_input
                 ON user_input.survey_id = previous_user_input.survey_id
                 AND previous_user_input.state = 'done'
-                AND previous_user_input.test_entry = False
+                AND previous_user_input.test_entry IS NOT TRUE
                 AND previous_user_input.id < user_input.id
                 AND (user_input.invite_token IS NULL OR user_input.invite_token = previous_user_input.invite_token)
                 AND (user_input.partner_id = previous_user_input.partner_id OR user_input.email = previous_user_input.email)