diff --git a/custom_action.go b/custom_action.go
index 88c525b..2ab588a 100644
--- a/custom_action.go
+++ b/custom_action.go
@@ -24,7 +24,7 @@ import (
 // Implementers of this interface must embed an CustomActionHandler struct
 // and provide implementations for the Run and Stop methods.
 type CustomActionImpl interface {
-	Run(ctx SyncContext, taskName, ActionParam string, curBox RectBuffer, curRecDetail string) bool
+	Run(ctx SyncContext, taskName, ActionParam string, curBox Rect, curRecDetail string) bool
 	Stop()
 
 	Handle() unsafe.Pointer
@@ -56,11 +56,12 @@ func _RunAgent(
 	actionArg C.MaaTransparentArg,
 ) C.uint8_t {
 	act := *(*CustomActionImpl)(unsafe.Pointer(actionArg))
+	curBoxRectBuffer := rectBuffer{handle: curBox}
 	ok := act.Run(
 		SyncContext{handle: ctx},
 		C.GoString(taskName),
 		C.GoString(customActionParam),
-		&rectBuffer{handle: curBox},
+		curBoxRectBuffer.Get(),
 		C.GoString(curRecDetail),
 	)
 	if ok {
diff --git a/run_without_file_test.go b/run_without_file_test.go
index c6afb22..6ac5856 100644
--- a/run_without_file_test.go
+++ b/run_without_file_test.go
@@ -10,7 +10,7 @@ type MyAct struct {
 	CustomActionHandler
 }
 
-func (act MyAct) Run(ctx SyncContext, taskName, ActionParam string, curBox RectBuffer, curRecDetail string) bool {
+func (act MyAct) Run(ctx SyncContext, taskName, ActionParam string, curBox Rect, curRecDetail string) bool {
 	image, ok := ctx.Screencap()
 	defer image.Destroy()
 	if !ok {