diff --git a/github/Repository.py b/github/Repository.py
index 1b5fe2b9..64c96e3e 100644
--- a/github/Repository.py
+++ b/github/Repository.py
@@ -1664,17 +1664,19 @@ class Repository(github.GithubObject.CompletableGithubObject):
         )
         return github.PullRequest.PullRequest(self._requester, headers, data, completed=True)
 
-    def get_pulls(self, state=github.GithubObject.NotSet, sort=github.GithubObject.NotSet, direction=github.GithubObject.NotSet):
+    def get_pulls(self, state=github.GithubObject.NotSet, sort=github.GithubObject.NotSet, direction=github.GithubObject.NotSet, base=github.GithubObject.NotSet):
         """
         :calls: `GET /repos/:owner/:repo/pulls <http://developer.github.com/v3/pulls>`_
         :param state: string
         :param sort: string
         :param direction: string
+        :param base: string
         :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.PullRequest.PullRequest`
         """
         assert state is github.GithubObject.NotSet or isinstance(state, (str, unicode)), state
         assert sort is github.GithubObject.NotSet or isinstance(sort, (str, unicode)), sort
         assert direction is github.GithubObject.NotSet or isinstance(direction, (str, unicode)), direction
+        assert base is github.GithubObject.NotSet or isinstance(base, (str, unicode)), base
         url_parameters = dict()
         if state is not github.GithubObject.NotSet:
             url_parameters["state"] = state
@@ -1682,6 +1684,8 @@ class Repository(github.GithubObject.CompletableGithubObject):
             url_parameters["sort"] = sort
         if direction is not github.GithubObject.NotSet:
             url_parameters["direction"] = direction
+        if base is not github.GithubObject.NotSet:
+            url_parameters["base"] = base
         return github.PaginatedList.PaginatedList(
             github.PullRequest.PullRequest,
             self._requester,