diff --git a/src/taskstub.js.c b/src/taskstub.js.c
index 3c7f7cd7..0844dfbd 100644
--- a/src/taskstub.js.c
+++ b/src/taskstub.js.c
@@ -291,12 +291,14 @@ static void _taskstub_on_process_exit(uv_process_t* process, int64_t status, int
 	JSContext* context = tf_task_get_context(stub->_owner);
 	if (!JS_IsUndefined(stub->_on_exit))
 	{
+		JSValue ref = JS_DupValue(context, stub->_on_exit);
 		JSValue argv[] = { JS_NewInt32(context, status), JS_NewInt32(context, terminationSignal) };
 		JSValue result = JS_Call(context, stub->_on_exit, JS_NULL, 2, argv);
 		tf_util_report_error(context, result);
 		JS_FreeValue(context, result);
 		JS_FreeValue(context, argv[0]);
 		JS_FreeValue(context, argv[1]);
+		JS_FreeValue(context, ref);
 	}
 	if (stub->_stream)
 	{