diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b8c96fe8..520a40e2 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -7,6 +7,7 @@ master (unreleased)
 
 * Fix: excluding the `.crowdin` directory in the flake8 tox job (#179).
 * Return the preview mode (form or table) with the accesses list (#121)
+* Fix: avoid installing formidable when not needed in tests - flake8 + isort checks (#181).
 
 Release 0.7.0 (2016-02-15)
 ==========================
diff --git a/formidable/serializers/access.py b/formidable/serializers/access.py
index 03eaba49..91a0ebda 100644
--- a/formidable/serializers/access.py
+++ b/formidable/serializers/access.py
@@ -2,13 +2,12 @@
 
 from __future__ import unicode_literals
 
-from rest_framework import serializers
-from rest_framework.serializers import ValidationError
-
 from formidable.accesses import get_accesses
 from formidable.constants import EDITABLE
 from formidable.models import Access
 from formidable.serializers.list import NestedListSerializer
+from rest_framework import serializers
+from rest_framework.serializers import ValidationError
 
 
 class SimpleAccessSerializer(serializers.BaseSerializer):
diff --git a/formidable/serializers/common.py b/formidable/serializers/common.py
index 6113dfba..209e0994 100644
--- a/formidable/serializers/common.py
+++ b/formidable/serializers/common.py
@@ -3,6 +3,7 @@
 from __future__ import unicode_literals
 
 import six
+
 from rest_framework import serializers
 
 
diff --git a/formidable/serializers/defaults.py b/formidable/serializers/defaults.py
index fe17cc4b..f3cf7f79 100644
--- a/formidable/serializers/defaults.py
+++ b/formidable/serializers/defaults.py
@@ -2,10 +2,9 @@
 
 from __future__ import unicode_literals
 
-from rest_framework import serializers
-
 from formidable.models import Default
 from formidable.serializers.list import NestedListSerializerDummyUpdate
+from rest_framework import serializers
 
 
 class DefaultListSerializer(NestedListSerializerDummyUpdate):
diff --git a/formidable/serializers/fields.py b/formidable/serializers/fields.py
index fb7bac8d..85dea00b 100644
--- a/formidable/serializers/fields.py
+++ b/formidable/serializers/fields.py
@@ -5,8 +5,6 @@
 from django.db.models import Prefetch
 from django.utils.functional import cached_property
 
-from rest_framework import serializers
-
 from formidable import constants
 from formidable.models import Access, Field, Item
 from formidable.register import FieldSerializerRegister, load_serializer
@@ -17,6 +15,7 @@
 from formidable.serializers.items import ItemSerializer
 from formidable.serializers.list import NestedListSerializer
 from formidable.serializers.validation import ValidationSerializer
+from rest_framework import serializers
 
 BASE_FIELDS = (
     'slug', 'label', 'type_id', 'placeholder', 'help_text',
diff --git a/formidable/serializers/forms.py b/formidable/serializers/forms.py
index 29f3d58b..d6768836 100644
--- a/formidable/serializers/forms.py
+++ b/formidable/serializers/forms.py
@@ -4,12 +4,11 @@
 
 from django.core.exceptions import ValidationError
 
-from rest_framework import serializers
-
 from formidable.models import Formidable
 from formidable.serializers import fields
 from formidable.serializers.common import WithNestedSerializer
 from formidable.serializers.presets import PresetModelSerializer
+from rest_framework import serializers
 
 
 class FormidableSerializer(WithNestedSerializer):
diff --git a/formidable/serializers/items.py b/formidable/serializers/items.py
index c6f3f4eb..62ccea7d 100644
--- a/formidable/serializers/items.py
+++ b/formidable/serializers/items.py
@@ -2,10 +2,9 @@
 
 from __future__ import unicode_literals
 
-from rest_framework import serializers
-
 from formidable.models import Item
 from formidable.serializers.list import NestedListSerializer
+from rest_framework import serializers
 
 
 class ItemListSerializer(NestedListSerializer):
diff --git a/formidable/serializers/presets.py b/formidable/serializers/presets.py
index 1c518497..c0817130 100644
--- a/formidable/serializers/presets.py
+++ b/formidable/serializers/presets.py
@@ -2,16 +2,15 @@
 
 from __future__ import unicode_literals
 
-from rest_framework import fields
-from rest_framework.serializers import (
-    CharField, ListSerializer, ModelSerializer, Serializer, ValidationError
-)
-
 from formidable.forms.validations.presets import presets_register
 from formidable.models import Preset, PresetArg
 from formidable.serializers.child_proxy import LazyChildProxy
 from formidable.serializers.common import WithNestedSerializer
 from formidable.serializers.list import NestedListSerializerDummyUpdate
+from rest_framework import fields
+from rest_framework.serializers import (
+    CharField, ListSerializer, ModelSerializer, Serializer, ValidationError
+)
 
 
 class ClassAttrSerializer(object):
diff --git a/formidable/serializers/validation.py b/formidable/serializers/validation.py
index 1ac873a2..94d81533 100644
--- a/formidable/serializers/validation.py
+++ b/formidable/serializers/validation.py
@@ -4,12 +4,11 @@
 
 import re
 
-from rest_framework import serializers
-from rest_framework.serializers import ValidationError
-
 from formidable.models import Validation
 from formidable.register import ValidationSerializerRegister, load_serializer
 from formidable.serializers.child_proxy import LazyChildProxy
+from rest_framework import serializers
+from rest_framework.serializers import ValidationError
 
 validation_register = ValidationSerializerRegister.get_instance()
 
diff --git a/formidable/views.py b/formidable/views.py
index f6eaed00..df3da22f 100644
--- a/formidable/views.py
+++ b/formidable/views.py
@@ -7,13 +7,6 @@
 from django.core.exceptions import ImproperlyConfigured
 
 import six
-from rest_framework import exceptions
-from rest_framework.generics import (
-    CreateAPIView, RetrieveAPIView, RetrieveUpdateAPIView
-)
-from rest_framework.response import Response
-from rest_framework.settings import import_from_string, perform_import
-from rest_framework.views import APIView
 
 from formidable.accesses import get_accesses, get_context
 from formidable.forms.field_builder import (
@@ -24,6 +17,13 @@
 from formidable.serializers import FormidableSerializer, SimpleAccessSerializer
 from formidable.serializers.forms import ContextFormSerializer
 from formidable.serializers.presets import PresetsSerializer
+from rest_framework import exceptions
+from rest_framework.generics import (
+    CreateAPIView, RetrieveAPIView, RetrieveUpdateAPIView
+)
+from rest_framework.response import Response
+from rest_framework.settings import import_from_string, perform_import
+from rest_framework.views import APIView
 
 logger = logging.getLogger(__name__)
 
diff --git a/tox.ini b/tox.ini
index 62c718ab..3c79eeca 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,6 +25,7 @@ commands =
 changedir =
     {toxinidir}
 deps = flake8
+skip_install = True
 commands =
     ; excluding git and cache dirs, tox-related dirs (default)
     ; excluding .crowdin directory (used for i18n processing)
@@ -34,6 +35,7 @@ commands =
 changedir =
     {toxinidir}
 deps = isort
+skip_install = True
 whitelist_externals = cat
 commands =
     cat setup.cfg