diff --git a/sub.go b/sub.go
index 6ab04185b5..547147e58c 100644
--- a/sub.go
+++ b/sub.go
@@ -35,6 +35,7 @@ type SubscriptionParams struct {
 	BillingCycleAnchor          *int64                     `form:"billing_cycle_anchor"`
 	BillingCycleAnchorNow       *bool                      `form:"-"` // See custom AppendTo
 	BillingCycleAnchorUnchanged *bool                      `form:"-"` // See custom AppendTo
+	CancelAtPeriodEnd           *bool                      `form:"cancel_at_period_end"`
 	Card                        *CardParams                `form:"card"`
 	Coupon                      *string                    `form:"coupon"`
 	Customer                    *string                    `form:"customer"`
@@ -51,9 +52,12 @@ type SubscriptionParams struct {
 	TrialEndNow                 *bool                      `form:"-"` // See custom AppendTo
 	TrialFromPlan               *bool                      `form:"trial_from_plan"`
 	TrialPeriodDays             *int64                     `form:"trial_period_days"`
+}
 
-	// Used for Cancel
-
+// SubscriptionCancelParams is the set of parameters that can be used when canceling a subscription.
+// For more details see https://stripe.com/docs/api#cancel_subscription
+type SubscriptionCancelParams struct {
+	Params      `form:"*"`
 	AtPeriodEnd *bool `form:"at_period_end"`
 }
 
diff --git a/sub/client.go b/sub/client.go
index 09d6ab3e8a..85af9d97e4 100644
--- a/sub/client.go
+++ b/sub/client.go
@@ -82,11 +82,11 @@ func (c Client) Update(id string, params *stripe.SubscriptionParams) (*stripe.Su
 
 // Cancel removes a subscription.
 // For more details see https://stripe.com/docs/api#cancel_subscription.
-func Cancel(id string, params *stripe.SubscriptionParams) (*stripe.Subscription, error) {
+func Cancel(id string, params *stripe.SubscriptionCancelParams) (*stripe.Subscription, error) {
 	return getC().Cancel(id, params)
 }
 
-func (c Client) Cancel(id string, params *stripe.SubscriptionParams) (*stripe.Subscription, error) {
+func (c Client) Cancel(id string, params *stripe.SubscriptionCancelParams) (*stripe.Subscription, error) {
 	var body *form.Values
 	var commonParams *stripe.Params
 
diff --git a/sub/client_test.go b/sub/client_test.go
index 567be7cc2a..56de1f1530 100644
--- a/sub/client_test.go
+++ b/sub/client_test.go
@@ -10,7 +10,9 @@ import (
 )
 
 func TestSubscriptionCancel(t *testing.T) {
-	subscription, err := Cancel("sub_123", nil)
+	subscription, err := Cancel("sub_123", &stripe.SubscriptionCancelParams{
+		AtPeriodEnd: stripe.Bool(true),
+	})
 	assert.Nil(t, err)
 	assert.NotNil(t, subscription)
 }