diff --git a/date_range/tests/test_date_range.py b/date_range/tests/test_date_range.py
index f5dc7d3..28d6d5c 100644
--- a/date_range/tests/test_date_range.py
+++ b/date_range/tests/test_date_range.py
@@ -6,6 +6,8 @@ from odoo.exceptions import ValidationError
 
 
 class DateRangeTest(TransactionCase):
+    post_install = True
+    at_install = False
 
     def setUp(self):
         super(DateRangeTest, self).setUp()
diff --git a/date_range/tests/test_date_range_generator.py b/date_range/tests/test_date_range_generator.py
index d7a0b55..4ff05de 100644
--- a/date_range/tests/test_date_range_generator.py
+++ b/date_range/tests/test_date_range_generator.py
@@ -7,6 +7,8 @@ from dateutil.rrule import MONTHLY
 
 
 class DateRangeGeneratorTest(TransactionCase):
+    post_install = True
+    at_install = False
 
     def setUp(self):
         super(DateRangeGeneratorTest, self).setUp()
diff --git a/date_range/tests/test_date_range_type.py b/date_range/tests/test_date_range_type.py
index 2ae1e97..8178c09 100644
--- a/date_range/tests/test_date_range_type.py
+++ b/date_range/tests/test_date_range_type.py
@@ -8,6 +8,8 @@ from odoo.exceptions import ValidationError
 
 
 class DateRangeTypeTest(TransactionCase):
+    post_install = True
+    at_install = False
 
     def setUp(self):
         super(DateRangeTypeTest, self).setUp()