diff --git a/cxx/videocap.cc b/cxx/videocap.cc
index 05ab369..e8f209f 100644
--- a/cxx/videocap.cc
+++ b/cxx/videocap.cc
@@ -96,6 +96,7 @@ Napi::Value CVVideoCapture::Read(const Napi::CallbackInfo &info)
 Napi::Value CVVideoCapture::Set(const Napi::CallbackInfo &info)
 {
 	capture_.set(info[0].As<Number>().Int32Value(), info[1].As<Number>().DoubleValue());
+	return info.Env().Undefined();
 }
 Napi::Value CVVideoCapture::Get(const Napi::CallbackInfo &info)
 {