diff --git a/esphomeyaml/components/time/sntp.py b/esphomeyaml/components/time/sntp.py
index 2f63891c07..8f9e72971b 100644
--- a/esphomeyaml/components/time/sntp.py
+++ b/esphomeyaml/components/time/sntp.py
@@ -9,7 +9,7 @@ SNTPComponent = time_.time_ns.class_('SNTPComponent', time_.RealTimeClockCompone
 
 PLATFORM_SCHEMA = time_.TIME_PLATFORM_SCHEMA.extend({
     cv.GenerateID(): cv.declare_variable_id(SNTPComponent),
-    vol.Optional(CONF_SERVERS): vol.All(cv.ensure_list, [cv.string], vol.Length(min=1, max=3)),
+    vol.Optional(CONF_SERVERS): vol.All(cv.ensure_list, [cv.domain], vol.Length(min=1, max=3)),
     vol.Optional(CONF_LAMBDA): cv.lambda_,
 }).extend(cv.COMPONENT_SCHEMA.schema)
 
diff --git a/esphomeyaml/config_validation.py b/esphomeyaml/config_validation.py
index 6a6cac907f..5a26a4d683 100644
--- a/esphomeyaml/config_validation.py
+++ b/esphomeyaml/config_validation.py
@@ -441,6 +441,13 @@ def hostname(value):
     return value
 
 
+def domain(value):
+    value = string(value)
+    if re.match(vol.DOMAIN_REGEX, value) is None:
+        raise vol.Invalid("Invalid domain: {}".format(value))
+    return value
+
+
 def domain_name(value):
     value = string(value)
     if not value.startswith('.'):