diff --git a/voluptuous/validators.py b/voluptuous/validators.py
index 776adb8..c513d19 100644
--- a/voluptuous/validators.py
+++ b/voluptuous/validators.py
@@ -102,7 +102,7 @@ class Coerce(object):
         ...   validate('foo')
     """
 
-    def __init__(self, type: type, msg: typing.Optional[str] = None) -> None:
+    def __init__(self, type: typing.Union[type, typing.Callable], msg: typing.Optional[str] = None) -> None:
         self.type = type
         self.msg = msg
         self.type_name = type.__name__