diff --git a/homeassistant/components/script.py b/homeassistant/components/script.py
index 3f892fdfa80..6d5f0ea37a1 100644
--- a/homeassistant/components/script.py
+++ b/homeassistant/components/script.py
@@ -16,7 +16,7 @@ import threading
 from homeassistant.helpers.entity_component import EntityComponent
 from homeassistant.helpers.entity import ToggleEntity
 from homeassistant.helpers.event import track_point_in_utc_time
-from homeassistant.util import split_entity_id
+from homeassistant.util import slugify, split_entity_id
 from homeassistant.const import (
     ATTR_ENTITY_ID, EVENT_TIME_CHANGED, STATE_ON, SERVICE_TURN_ON,
     SERVICE_TURN_OFF)
@@ -70,14 +70,17 @@ def setup(hass, config):
         if script:
             script.turn_on()
 
-    for name, cfg in config[DOMAIN].items():
-        if not cfg.get(CONF_SEQUENCE):
-            _LOGGER.warn("Missing key 'sequence' for script %s", name)
+    for object_id, cfg in config[DOMAIN].items():
+        if object_id != slugify(object_id):
+            _LOGGER.warn("Found invalid key for script: %s. Use %s instead.",
+                         object_id, slugify(object_id))
             continue
-        alias = cfg.get(CONF_ALIAS, name)
-        script = Script(hass, alias, cfg[CONF_SEQUENCE])
+        if not cfg.get(CONF_SEQUENCE):
+            _LOGGER.warn("Missing key 'sequence' for script %s", object_id)
+            continue
+        alias = cfg.get(CONF_ALIAS, object_id)
+        script = Script(hass, object_id, alias, cfg[CONF_SEQUENCE])
         component.add_entities((script,))
-        _, object_id = split_entity_id(script.entity_id)
         hass.services.register(DOMAIN, object_id, service_handler)
 
     def turn_on_service(service):
@@ -100,8 +103,10 @@ def setup(hass, config):
 
 class Script(ToggleEntity):
     """ Represents a script. """
-    def __init__(self, hass, name, sequence):
+    # pylint: disable=too-many-instance-attributes
+    def __init__(self, hass, object_id, name, sequence):
         self.hass = hass
+        self.entity_id = ENTITY_ID_FORMAT.format(object_id)
         self._name = name
         self.sequence = sequence
         self._lock = threading.Lock()
diff --git a/homeassistant/helpers/entity_component.py b/homeassistant/helpers/entity_component.py
index 708bf6e93a9..d3c0514dcad 100644
--- a/homeassistant/helpers/entity_component.py
+++ b/homeassistant/helpers/entity_component.py
@@ -65,8 +65,10 @@ class EntityComponent(object):
             if entity is not None and entity not in self.entities.values():
                 entity.hass = self.hass
 
-                entity.entity_id = generate_entity_id(
-                    self.entity_id_format, entity.name, self.entities.keys())
+                if getattr(entity, 'entity_id', None) is None:
+                    entity.entity_id = generate_entity_id(
+                        self.entity_id_format, entity.name,
+                        self.entities.keys())
 
                 self.entities[entity.entity_id] = entity
 
diff --git a/tests/components/test_script.py b/tests/components/test_script.py
index d3974661bc6..e4abed18ec9 100644
--- a/tests/components/test_script.py
+++ b/tests/components/test_script.py
@@ -47,7 +47,18 @@ class TestScript(unittest.TestCase):
             }
         }))
 
-        self.assertIsNone(self.hass.states.get(ENTITY_ID))
+        self.assertEqual(0, len(self.hass.states.entity_ids('script')))
+
+    def test_setup_with_invalid_object_id(self):
+        self.assertTrue(script.setup(self.hass, {
+            'script': {
+                'test hello world': {
+                    'sequence': []
+                }
+            }
+        }))
+
+        self.assertEqual(0, len(self.hass.states.entity_ids('script')))
 
     def test_firing_event(self):
         event = 'test_event'
@@ -61,6 +72,7 @@ class TestScript(unittest.TestCase):
         self.assertTrue(script.setup(self.hass, {
             'script': {
                 'test': {
+                    'alias': 'Test Script',
                     'sequence': [{
                         'event': event,
                         'event_data': {