diff --git a/pagerduty/service.go b/pagerduty/service.go
index eb3db649..b92180ea 100644
--- a/pagerduty/service.go
+++ b/pagerduty/service.go
@@ -60,10 +60,10 @@ type Integration struct {
 
 // Service represents a service.
 type Service struct {
-	AcknowledgementTimeout int                        `json:"acknowledgement_timeout,omitempty"`
+	AcknowledgementTimeout int                        `json:"acknowledgement_timeout"`
 	Addons                 []*AddonReference          `json:"addons,omitempty"`
 	AlertCreation          string                     `json:"alert_creation,omitempty"`
-	AutoResolveTimeout     int                        `json:"auto_resolve_timeout,omitempty"`
+	AutoResolveTimeout     int                        `json:"auto_resolve_timeout"`
 	CreatedAt              string                     `json:"created_at,omitempty"`
 	Description            string                     `json:"description,omitempty"`
 	EscalationPolicy       *EscalationPolicyReference `json:"escalation_policy,omitempty"`