diff --git a/openatlas/forms/validation.py b/openatlas/forms/validation.py
index 57244dccc..e54eabf70 100644
--- a/openatlas/forms/validation.py
+++ b/openatlas/forms/validation.py
@@ -26,7 +26,7 @@ def hierarchy_name_exists(form: FlaskForm, field: TreeField) -> None:
             field.errors.append(_('error name exists'))
 
 
-def validate(form: FlaskForm) -> bool:
+def validate(form: FlaskForm, extra_validators=None) -> bool:
     valid = FlaskForm.validate(form)
     if hasattr(form, 'begin_year_from'):  # Dates
         if not validate_dates(form):
diff --git a/openatlas/views/imports.py b/openatlas/views/imports.py
index 133edccbc..ce7a773ef 100644
--- a/openatlas/views/imports.py
+++ b/openatlas/views/imports.py
@@ -33,7 +33,7 @@ class ProjectForm(FlaskForm):
     description = TextAreaField(_('description'))
     save = SubmitField(_('insert'))
 
-    def validate(self) -> bool:
+    def validate(self, extra_validators=None) -> bool:
         valid = FlaskForm.validate(self)
         name = Import.get_project_by_id(self.project_id).name \
             if self.project_id else ''
@@ -150,7 +150,7 @@ class ImportForm(FlaskForm):
     duplicate = BooleanField(_('check for duplicates'), default=True)
     save = SubmitField(_('import'))
 
-    def validate(self) -> bool:
+    def validate(self, extra_validators=None) -> bool:
         valid = FlaskForm.validate(self)
         if pathlib.Path(request.files['file'].filename) \
                 .suffix.lower() != '.csv':
diff --git a/openatlas/views/profile.py b/openatlas/views/profile.py
index 595802c51..8a1ca7918 100644
--- a/openatlas/views/profile.py
+++ b/openatlas/views/profile.py
@@ -29,7 +29,7 @@ class PasswordForm(FlaskForm):
     show_passwords = BooleanField(_('show passwords'))
     save = SubmitField(_('save'))
 
-    def validate(self) -> bool:
+    def validate(self, extra_validators=None) -> bool:
         valid = FlaskForm.validate(self)
         hash_ = bcrypt.hashpw(
             self.password_old.data.encode('utf-8'),
diff --git a/openatlas/views/search.py b/openatlas/views/search.py
index c0130ba1a..03015fb68 100644
--- a/openatlas/views/search.py
+++ b/openatlas/views/search.py
@@ -54,7 +54,7 @@ class SearchForm(FlaskForm):
         validators=validator_day)
     include_dateless = BooleanField(_('Include dateless entities'))
 
-    def validate(self) -> bool:
+    def validate(self, extra_validators=None) -> bool:
         valid = FlaskForm.validate(self)
         from_date = form_to_datetime64(
             self.begin_year.data,
diff --git a/openatlas/views/user.py b/openatlas/views/user.py
index 52abd970a..819fef06a 100644
--- a/openatlas/views/user.py
+++ b/openatlas/views/user.py
@@ -43,7 +43,7 @@ class UserForm(FlaskForm):
     insert_and_continue = SubmitField(_('insert and continue'))
     continue_ = HiddenField()
 
-    def validate(self) -> bool:
+    def validate(self, extra_validators=None) -> bool:
         valid = FlaskForm.validate(self)
         username = ''
         user_email = ''