diff --git a/api/agent.go b/api/agent.go
index 53946636e..4b144fe18 100644
--- a/api/agent.go
+++ b/api/agent.go
@@ -65,6 +65,7 @@ type AgentCheckRegistration struct {
 type AgentServiceCheck struct {
 	Script   string `json:",omitempty"`
 	Interval string `json:",omitempty"`
+	Timeout  string `json:",omitempty"`
 	TTL      string `json:",omitempty"`
 	HTTP     string `json:",omitempty"`
 }