diff --git a/esphome/helpers.py b/esphome/helpers.py
index 00416b591f..254c950b5d 100644
--- a/esphome/helpers.py
+++ b/esphome/helpers.py
@@ -357,7 +357,7 @@ def snake_case(value):
     return value.replace(" ", "_").lower()
 
 
-_DISALLOWED_CHARS = re.compile(r"[^a-zA-Z0-9_]")
+_DISALLOWED_CHARS = re.compile(r"[^a-zA-Z0-9-_]")
 
 
 def sanitize(value):
diff --git a/tests/unit_tests/test_helpers.py b/tests/unit_tests/test_helpers.py
index 79d39901f0..fc6bdbcdec 100644
--- a/tests/unit_tests/test_helpers.py
+++ b/tests/unit_tests/test_helpers.py
@@ -261,6 +261,7 @@ def test_snake_case(text, expected):
         ('!"§$%&/()=?foo_bar', "___________foo_bar"),
         ('foo_!"§$%&/()=?bar', "foo____________bar"),
         ('foo_bar!"§$%&/()=?', "foo_bar___________"),
+        ('foo-bar!"§$%&/()=?', "foo-bar___________"),
     ),
 )
 def test_sanitize(text, expected):