diff --git a/github/event_types.go b/github/event_types.go
index 8330353a3c1..50c7b567bcf 100644
--- a/github/event_types.go
+++ b/github/event_types.go
@@ -485,6 +485,7 @@ type IssuesEvent struct {
 	Repo         *Repository   `json:"repository,omitempty"`
 	Sender       *User         `json:"sender,omitempty"`
 	Installation *Installation `json:"installation,omitempty"`
+	Milestone    *Milestone    `json:"milestone,omitempty"`
 }
 
 // LabelEvent is triggered when a repository's label is created, edited, or deleted.
diff --git a/github/github-accessors.go b/github/github-accessors.go
index 63b1079cdfd..f502995ef16 100644
--- a/github/github-accessors.go
+++ b/github/github-accessors.go
@@ -8390,6 +8390,14 @@ func (i *IssuesEvent) GetLabel() *Label {
 	return i.Label
 }
 
+// GetMilestone returns the Milestone field.
+func (i *IssuesEvent) GetMilestone() *Milestone {
+	if i == nil {
+		return nil
+	}
+	return i.Milestone
+}
+
 // GetRepo returns the Repo field.
 func (i *IssuesEvent) GetRepo() *Repository {
 	if i == nil {
diff --git a/github/github-accessors_test.go b/github/github-accessors_test.go
index 961eba82888..8fea0bb5fd9 100644
--- a/github/github-accessors_test.go
+++ b/github/github-accessors_test.go
@@ -9843,6 +9843,13 @@ func TestIssuesEvent_GetLabel(tt *testing.T) {
 	i.GetLabel()
 }
 
+func TestIssuesEvent_GetMilestone(tt *testing.T) {
+	i := &IssuesEvent{}
+	i.GetMilestone()
+	i = nil
+	i.GetMilestone()
+}
+
 func TestIssuesEvent_GetRepo(tt *testing.T) {
 	i := &IssuesEvent{}
 	i.GetRepo()