diff --git a/searx/engines/__init__.py b/searx/engines/__init__.py
index 8d49bae8a..9472186bf 100644
--- a/searx/engines/__init__.py
+++ b/searx/engines/__init__.py
@@ -45,6 +45,9 @@ ENGINE_DEFAULT_ARGS = {
     "display_error_messages": True,
     "tokens": [],
 }
+# set automatically when an engine does not have any tab category
+OTHER_CATEGORY = 'other'
+
 """Defaults for the namespace of an engine module, see :py:func:`load_engine`"""
 
 categories = {'general': []}
@@ -114,6 +117,9 @@ def load_engine(engine_data):
 
     set_loggers(engine, engine_name)
 
+    if not any(cat in settings['categories_as_tabs'] for cat in engine.categories):
+        engine.categories.append(OTHER_CATEGORY)
+
     return engine
 
 
@@ -274,7 +280,7 @@ def group_engines_in_tab(engines):  # pylint: disable=redefined-outer-name
         return (group[0] == DEFAULT_GROUP_NAME, group[0].lower())
 
     def get_group(eng):
-        non_tab_engines = [c for c in eng.categories if c not in settings['categories_as_tabs']]
+        non_tab_engines = [c for c in eng.categories if c not in settings['categories_as_tabs'] + [OTHER_CATEGORY]]
         return non_tab_engines[0] if len(non_tab_engines) > 0 else DEFAULT_GROUP_NAME
 
     return [
diff --git a/searx/templates/oscar/preferences.html b/searx/templates/oscar/preferences.html
index 810e6f072..341c203b0 100644
--- a/searx/templates/oscar/preferences.html
+++ b/searx/templates/oscar/preferences.html
@@ -298,7 +298,7 @@
             <div class="tab-pane active_if_nojs" id="tab_engine">
                 <!-- Nav tabs -->
                 <ul class="nav nav-tabs nav-justified hide_if_nojs" role="tablist">
-                    {% for categ in categories_as_tabs %}
+                    {% for categ in categories_as_tabs + [OTHER_CATEGORY] %}
                     <li{% if loop.first %} class="active"{% endif %}><a href="#tab_engine_{{ categ|replace(' ', '_') }}" role="tab" data-toggle="tab">{{ _(categ) }}</a></li>
                     {% endfor %}
                 </ul>
@@ -317,7 +317,7 @@
                         </p>
                     </div>
 
-                    {% for categ in categories_as_tabs %}
+                    {% for categ in categories_as_tabs + [OTHER_CATEGORY] %}
                     <noscript><label>{{ _(categ) }}</label>
                     </noscript>
                     <div class="tab-pane{% if loop.first %} active{% endif %} active_if_nojs" id="tab_engine_{{ categ|replace(' ', '_') }}">
diff --git a/searx/templates/simple/preferences.html b/searx/templates/simple/preferences.html
index b4676d131..bec478f26 100644
--- a/searx/templates/simple/preferences.html
+++ b/searx/templates/simple/preferences.html
@@ -274,7 +274,7 @@
   {{ tab_header('maintab', 'engines', _('Engines')) }}
     <p>{{ _('Currently used search engines') }}</p>
     {{ tabs_open() }}
-    {% for categ in categories_as_tabs %}
+    {% for categ in categories_as_tabs + [OTHER_CATEGORY] %}
     {{ tab_header('enginetab', 'category' + categ, _(categ)) }}
     <div class="scrollx">
     <table class="striped">
diff --git a/searx/webapp.py b/searx/webapp.py
index 9ce7b9d5a..c0467932e 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -59,6 +59,7 @@ from searx.settings_defaults import OUTPUT_FORMATS
 from searx.settings_loader import get_default_settings_path
 from searx.exceptions import SearxParameterException
 from searx.engines import (
+    OTHER_CATEGORY,
     DEFAULT_GROUP_NAME,
     categories,
     engines,
@@ -182,6 +183,7 @@ _category_names = (
     gettext('software wikis'),
     gettext('web'),
     gettext(DEFAULT_GROUP_NAME),
+    gettext(OTHER_CATEGORY),
 )
 
 _simple_style = (gettext('auto'), gettext('light'), gettext('dark'))
@@ -439,6 +441,7 @@ def render(template_name, override_theme=None, **kwargs):
     kwargs['theme'] = get_current_theme_name(override=override_theme)
     kwargs['categories_as_tabs'] = settings['categories_as_tabs']
     kwargs['categories'] = _get_enable_categories(categories.keys())
+    kwargs['OTHER_CATEGORY'] = OTHER_CATEGORY
 
     # i18n
     kwargs['language_codes'] = [l for l in languages if l[0] in settings['search']['languages']]