diff --git a/homeassistant/components/sensor/yr.py b/homeassistant/components/sensor/yr.py
index 0b4c6919994..71a4e60e8a6 100644
--- a/homeassistant/components/sensor/yr.py
+++ b/homeassistant/components/sensor/yr.py
@@ -129,7 +129,7 @@ class YrSensor(Entity):
         """Weather symbol if type is symbol."""
         if self.type != 'symbol':
             return None
-        return "//api.met.no/weatherapi/weathericon/1.1/" \
+        return "https://api.met.no/weatherapi/weathericon/1.1/" \
                "?symbol={0};content_type=image/png".format(self._state)
 
     @property