diff --git a/ereuse_devicehub/resources/action/models.py b/ereuse_devicehub/resources/action/models.py
index 02045be9..107be562 100644
--- a/ereuse_devicehub/resources/action/models.py
+++ b/ereuse_devicehub/resources/action/models.py
@@ -213,18 +213,6 @@ class Action(Thing):
             args[INHERIT_COND] = cls.id == Action.id
         return args
 
-    @validates('end_time')
-    def validate_end_time(self, _, end_time: datetime):
-        if self.start_time and end_time < self.start_time:
-            raise ValidationError('The action cannot finish before it starts.')
-        return end_time
-
-    @validates('start_time')
-    def validate_start_time(self, _, start_time: datetime):
-        if self.end_time and start_time > self.end_time:
-            raise ValidationError('The action cannot start after it finished.')
-        return start_time
-
     @property
     def date_str(self):
         return '{:%c}'.format(self.end_time)
diff --git a/ereuse_devicehub/resources/action/schemas.py b/ereuse_devicehub/resources/action/schemas.py
index bca1d8db..df93b107 100644
--- a/ereuse_devicehub/resources/action/schemas.py
+++ b/ereuse_devicehub/resources/action/schemas.py
@@ -55,6 +55,10 @@ class Action(Thing):
         if 'start_time' in data and data['start_time'] < unix_time:
             data['start_time'] = unix_time
 
+        if data.get('end_time') and data.get('start_time'):
+            if data['start_time'] > data['end_time']:
+                raise ValidationError('The action cannot finish before it starts.')
+
 
 class ActionWithOneDevice(Action):
     __doc__ = m.ActionWithOneDevice.__doc__