diff --git a/homeassistant/components/sensor/cpuspeed.py b/homeassistant/components/sensor/cpuspeed.py
index cdfb6b5c874..54bb5e3bc2c 100644
--- a/homeassistant/components/sensor/cpuspeed.py
+++ b/homeassistant/components/sensor/cpuspeed.py
@@ -19,6 +19,7 @@ DEFAULT_NAME = "CPU speed"
 ATTR_VENDOR = 'Vendor ID'
 ATTR_BRAND = 'Brand'
 ATTR_HZ = 'GHz Advertised'
+ICON = 'mdi:pulse'
 
 
 # pylint: disable=unused-variable
@@ -62,6 +63,11 @@ class CpuSpeedSensor(Entity):
                 ATTR_HZ: round(self.info['hz_advertised_raw'][0]/10**9, 2)
             }
 
+    @property
+    def icon(self):
+        """ Icon to use in the frontend, if any. """
+        return ICON
+
     def update(self):
         """ Gets the latest data and updates the state. """
         from cpuinfo import cpuinfo
diff --git a/homeassistant/components/sensor/worldclock.py b/homeassistant/components/sensor/worldclock.py
index c7d01578570..13ec4c2fb21 100644
--- a/homeassistant/components/sensor/worldclock.py
+++ b/homeassistant/components/sensor/worldclock.py
@@ -14,6 +14,7 @@ from homeassistant.helpers.entity import Entity
 
 _LOGGER = logging.getLogger(__name__)
 DEFAULT_NAME = "Worldclock Sensor"
+ICON = 'mdi:clock'
 
 
 def setup_platform(hass, config, add_devices, discovery_info=None):
@@ -54,6 +55,11 @@ class WorldClockSensor(Entity):
         """ Returns the state of the device. """
         return self._state
 
+    @property
+    def icon(self):
+        """ Icon to use in the frontend, if any. """
+        return ICON
+
     def update(self):
         """ Gets the time and updates the states. """
         self._state = dt_util.datetime_to_time_str(