diff --git a/src/fs_event_wrap.cc b/src/fs_event_wrap.cc
index cf9559df9d..2354a1be0c 100644
--- a/src/fs_event_wrap.cc
+++ b/src/fs_event_wrap.cc
@@ -88,6 +88,7 @@ void FSEventWrap::Start(const FunctionCallbackInfo<Value>& args) {
 
   FSEventWrap* wrap;
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
+  CHECK_EQ(wrap->initialized_, false);
 
   static const char kErrMsg[] = "filename must be a string or Buffer";
   if (args.Length() < 1)