diff --git a/supervisor/validate.py b/supervisor/validate.py
index 4323c6511..f5e7ba3d6 100644
--- a/supervisor/validate.py
+++ b/supervisor/validate.py
@@ -42,7 +42,7 @@ from .const import (
 from .utils.validate import validate_timezone
 
 # Move to store.validate when addons_repository config removed
-RE_REPOSITORY = re.compile(r"^(?P<url>[^#]+)(?:#(?P<branch>[\w\-]+))?$")
+RE_REPOSITORY = re.compile(r"^(?P<url>[^#]+)(?:#(?P<branch>[\w\-.]+))?$")
 RE_REGISTRY = re.compile(r"^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$")
 
 # pylint: disable=no-value-for-parameter