diff --git a/github/github.go b/github/github.go
index 3aa643c..558e673 100644
--- a/github/github.go
+++ b/github/github.go
@@ -42,9 +42,6 @@ const (
 
 	// https://developer.github.com/changes/2014-12-09-new-attributes-for-stars-api/
 	mediaTypeStarringPreview = "application/vnd.github.v3.star+json"
-
-	// https://developer.github.com/changes/2014-12-08-organization-permissions-api-preview/
-	mediaTypeOrganizationsPreview = "application/vnd.github.moondragon+json"
 )
 
 // A Client manages communication with the GitHub API.
diff --git a/github/repos.go b/github/repos.go
index 86d9ad0..ed9052c 100644
--- a/github/repos.go
+++ b/github/repos.go
@@ -122,11 +122,6 @@ type RepositoryListOptions struct {
 	// Default is "asc" when sort is "full_name", otherwise default is "desc".
 	Direction string `url:"direction,omitempty"`
 
-	// Include orginization repositories the user has access to.
-	// This will become the default behavior in the future, but is opt-in for now.
-	// See https://developer.github.com/changes/2015-01-07-prepare-for-organization-permissions-changes/
-	IncludeOrg bool `url:"-"`
-
 	ListOptions
 }
 
@@ -151,10 +146,6 @@ func (s *RepositoriesService) List(user string, opt *RepositoryListOptions) ([]R
 		return nil, nil, err
 	}
 
-	if opt != nil && opt.IncludeOrg {
-		req.Header.Set("Accept", mediaTypeOrganizationsPreview)
-	}
-
 	repos := new([]Repository)
 	resp, err := s.client.Do(req, repos)
 	if err != nil {
diff --git a/github/repos_test.go b/github/repos_test.go
index 2480b88..3a2c413 100644
--- a/github/repos_test.go
+++ b/github/repos_test.go
@@ -45,11 +45,10 @@ func TestRepositoriesService_List_specifiedUser(t *testing.T) {
 			"direction": "asc",
 			"page":      "2",
 		})
-		testHeader(t, r, "Accept", mediaTypeOrganizationsPreview)
 		fmt.Fprint(w, `[{"id":1}]`)
 	})
 
-	opt := &RepositoryListOptions{"owner", "created", "asc", true, ListOptions{Page: 2}}
+	opt := &RepositoryListOptions{"owner", "created", "asc", ListOptions{Page: 2}}
 	repos, _, err := client.Repositories.List("u", opt)
 	if err != nil {
 		t.Errorf("Repositories.List returned error: %v", err)