diff --git a/src/node_file.cc b/src/node_file.cc
index 5bd0237e7b0556..4301cdc7b4e410 100644
--- a/src/node_file.cc
+++ b/src/node_file.cc
@@ -1130,7 +1130,7 @@ static void FTruncate(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[0]->IsInt32());
   const int fd = args[0].As<Int32>()->Value();
 
-  CHECK(args[1]->IsNumber());
+  CHECK(IsSafeJsInt(args[1]));
   const int64_t len = args[1].As<Integer>()->Value();
 
   FSReqBase* req_wrap_async = GetReqWrap(env, args[2]);