diff --git a/options.go b/options.go
index 53fc0a1..d18abd9 100644
--- a/options.go
+++ b/options.go
@@ -196,3 +196,7 @@ func isStdLibStack(s stack.Stack) bool {
 	// Using signal.Notify will start a runtime goroutine.
 	return s.HasFunction("runtime.ensureSigM")
 }
+
+func isTraceStack(s stack.Stack) bool {
+	return s.HasFunction("runtime.ReadTrace")
+}
diff --git a/tracestack_new.go b/tracestack_new.go
deleted file mode 100644
index 4fc6cef..0000000
--- a/tracestack_new.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright (c) 2021-2023 Uber Technologies, Inc.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-//go:build go1.16
-// +build go1.16
-
-package goleak
-
-import "go.uber.org/goleak/internal/stack"
-
-func isTraceStack(s stack.Stack) bool {
-	return s.HasFunction("runtime.ReadTrace")
-}