diff --git a/internal/dhcpd/dhcpd.go b/internal/dhcpd/dhcpd.go
index 6ac830d6..c26f32ed 100644
--- a/internal/dhcpd/dhcpd.go
+++ b/internal/dhcpd/dhcpd.go
@@ -102,8 +102,9 @@ func (l Lease) MarshalJSON() ([]byte, error) {
 
 	type lease Lease
 	return json.Marshal(&struct {
-		HWAddr string `json:"mac"`
-		Expiry string `json:"expires,omitempty"`
+		HWAddr   string `json:"mac"`
+		Expiry   string `json:"expires,omitempty"`
+		IsStatic bool   `json:"static,omitempty"`
 		lease
 	}{
 		HWAddr: l.HWAddr.String(),
diff --git a/openapi/openapi.yaml b/openapi/openapi.yaml
index 21f6ef66..6d1d02f3 100644
--- a/openapi/openapi.yaml
+++ b/openapi/openapi.yaml
@@ -1849,7 +1849,6 @@
       - 'mac'
       - 'ip'
       - 'hostname'
-      - 'expires'
       'properties':
         'mac':
           'type': 'string'