diff --git a/invoke/_version.py b/invoke/_version.py
index 17f4ce42..98f13cbc 100644
--- a/invoke/_version.py
+++ b/invoke/_version.py
@@ -1,2 +1,2 @@
-__version_info__ = (1, 7, 3)
+__version_info__ = (1, 7, 6)
 __version__ = ".".join(map(str, __version_info__))
diff --git a/invoke/tasks.py b/invoke/tasks.py
index f2069916..3ddf0bfe 100644
--- a/invoke/tasks.py
+++ b/invoke/tasks.py
@@ -4,12 +4,12 @@
 """
 
 from copy import deepcopy
-import inspect
 import types
 
 from .context import Context
 from .parser import Argument, translate_underscores
 from .util import six
+from .vendor.decorator import getargspec
 
 if six.PY3:
     from itertools import zip_longest
@@ -150,7 +150,7 @@ def argspec(self, body):
         # TODO: __call__ exhibits the 'self' arg; do we manually nix 1st result
         # in argspec, or is there a way to get the "really callable" spec?
         func = body if isinstance(body, types.FunctionType) else body.__call__
-        spec = inspect.getargspec(func)
+        spec = getargspec(func)
         arg_names = spec.args[:]
         matched_args = [reversed(x) for x in [spec.args, spec.defaults or []]]
         spec_dict = dict(zip_longest(*matched_args, fillvalue=NO_DEFAULT))