diff --git a/pkg/wfexec/prompt.go b/pkg/wfexec/prompt.go
index 01e09960f..3d2828f46 100644
--- a/pkg/wfexec/prompt.go
+++ b/pkg/wfexec/prompt.go
@@ -24,7 +24,7 @@ type (
 	PendingPrompt struct {
 		Ref       string     `json:"ref"`
 		SessionID uint64     `json:"sessionID,string"`
-		CreatedAt time.Time  `json:"created"`
+		CreatedAt time.Time  `json:"createdAt"`
 		StateID   uint64     `json:"stateID,string"`
 		Payload   *expr.Vars `json:"payload"`
 	}
diff --git a/pkg/wfexec/session.go b/pkg/wfexec/session.go
index 7d076f642..9d828a037 100644
--- a/pkg/wfexec/session.go
+++ b/pkg/wfexec/session.go
@@ -65,7 +65,7 @@ type (
 	sessionOpt func(*Session)
 
 	Frame struct {
-		Created   time.Time     `json:"created"`
+		CreatedAt time.Time     `json:"createdAt"`
 		SessionID uint64        `json:"sessionID"`
 		StateID   uint64        `json:"stateID"`
 		Input     *expr.Vars    `json:"input"`
diff --git a/pkg/wfexec/state.go b/pkg/wfexec/state.go
index d183bbb4a..51c83080a 100644
--- a/pkg/wfexec/state.go
+++ b/pkg/wfexec/state.go
@@ -121,7 +121,7 @@ func (s State) loopCurr() Iterator {
 
 func (s State) MakeFrame() *Frame {
 	f := &Frame{
-		Created:   s.created,
+		CreatedAt: s.created,
 		SessionID: s.sessionId,
 		StateID:   s.stateId,
 		Input:     s.input,