diff --git a/api/types/swarm/secret.go b/api/types/swarm/secret.go
index 91f3578428..f9b1e92669 100644
--- a/api/types/swarm/secret.go
+++ b/api/types/swarm/secret.go
@@ -13,7 +13,7 @@ type Secret struct {
 type SecretSpec struct {
 	Annotations
 	Data   []byte  `json:",omitempty"`
-	Driver *Driver `json:"omitempty"` // name of the secrets driver used to fetch the secret's value from an external secret store
+	Driver *Driver `json:",omitempty"` // name of the secrets driver used to fetch the secret's value from an external secret store
 }
 
 // SecretReferenceFileTarget is a file target in a secret reference