diff --git a/esphome/config_validation.py b/esphome/config_validation.py
index 9862a52c3e..3fb2b4827c 100644
--- a/esphome/config_validation.py
+++ b/esphome/config_validation.py
@@ -11,9 +11,9 @@ from string import ascii_letters, digits
 import voluptuous as vol
 
 from esphome import core
-from esphome.const import CONF_AVAILABILITY, CONF_COMMAND_TOPIC, CONF_DISCOVERY, CONF_ID, \
-    CONF_INTERNAL, CONF_NAME, CONF_PAYLOAD_AVAILABLE, CONF_PAYLOAD_NOT_AVAILABLE, \
-    CONF_RETAIN, CONF_SETUP_PRIORITY, CONF_STATE_TOPIC, CONF_TOPIC, \
+from esphome.const import ALLOWED_NAME_CHARS, CONF_AVAILABILITY, CONF_COMMAND_TOPIC, \
+    CONF_DISCOVERY, CONF_ID, CONF_INTERNAL, CONF_NAME, CONF_PAYLOAD_AVAILABLE, \
+    CONF_PAYLOAD_NOT_AVAILABLE, CONF_RETAIN, CONF_SETUP_PRIORITY, CONF_STATE_TOPIC, CONF_TOPIC, \
     CONF_HOUR, CONF_MINUTE, CONF_SECOND, CONF_VALUE, CONF_UPDATE_INTERVAL, CONF_TYPE_ID, CONF_TYPE
 from esphome.core import CORE, HexInt, IPAddress, Lambda, TimePeriod, TimePeriodMicroseconds, \
     TimePeriodMilliseconds, TimePeriodSeconds, TimePeriodMinutes
@@ -40,8 +40,6 @@ ALLOW_EXTRA = vol.ALLOW_EXTRA
 UNDEFINED = vol.UNDEFINED
 RequiredFieldInvalid = vol.RequiredFieldInvalid
 
-ALLOWED_NAME_CHARS = 'abcdefghijklmnopqrstuvwxyz0123456789_-'
-
 RESERVED_IDS = [
     # C++ keywords http://en.cppreference.com/w/cpp/keyword
     'alignas', 'alignof', 'and', 'and_eq', 'asm', 'auto', 'bitand', 'bitor', 'bool', 'break',
diff --git a/esphome/wizard.py b/esphome/wizard.py
index 97c45c9e1a..3ec6c9fd10 100644
--- a/esphome/wizard.py
+++ b/esphome/wizard.py
@@ -11,6 +11,7 @@ from esphome.helpers import color, get_bool_env, write_file
 from esphome.pins import ESP32_BOARD_PINS, ESP8266_BOARD_PINS
 from esphome.storage_json import StorageJSON, ext_storage_path
 from esphome.util import safe_print
+from esphome.const import ALLOWED_NAME_CHARS
 
 CORE_BIG = r"""    _____ ____  _____  ______
    / ____/ __ \|  __ \|  ____|
@@ -172,7 +173,7 @@ def wizard(path):
                                     f"include numbers, lower-case letters, underscores and "
                                     f"hyphens."))
             name = strip_accents(name).lower().replace(' ', '_')
-            name = ''.join(c for c in name if c in cv.ALLOWED_NAME_CHARS)
+            name = ''.join(c for c in name if c in ALLOWED_NAME_CHARS)
             safe_print("Shall I use \"{}\" as the name instead?".format(color('cyan', name)))
             sleep(0.5)
             name = default_input("(name [{}]): ", name)