diff --git a/counter/counter.go b/counter/counter.go
index e6af9ea..850663d 100644
--- a/counter/counter.go
+++ b/counter/counter.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.19
-
 package counter
 
 // The implementation of this package and tests are located in
diff --git a/counter/counter_118.go b/counter/counter_118.go
deleted file mode 100644
index 432e0d7..0000000
--- a/counter/counter_118.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.19
-
-package counter
-
-import (
-	"flag"
-)
-
-func Add(string, int64)                         {}
-func Inc(string)                                {}
-func Open()                                     {}
-func CountFlags(prefix string, fs flag.FlagSet) {}
-
-type Counter struct{ name string }
-
-func New(name string) *Counter  { return &Counter{name} }
-func (c *Counter) Add(n int64)  {}
-func (c *Counter) Inc()         {}
-func (c *Counter) Name() string { return c.name }
-
-type StackCounter struct{ name string }
-
-func NewStack(name string, _ int) *StackCounter { return &StackCounter{name} }
-func (c *StackCounter) Counters() []*Counter    { return nil }
-func (c *StackCounter) Inc()                    {}
-func (c *StackCounter) Names() []string         { return nil }
diff --git a/counter/countertest/countertest.go b/counter/countertest/countertest.go
index b9bec1f..daad800 100644
--- a/counter/countertest/countertest.go
+++ b/counter/countertest/countertest.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.19
-
 // countertest provides testing utilities for counters.
 // This package cannot be used except for testing.
 package countertest
diff --git a/counter/countertest/countertest_go118.go b/counter/countertest/countertest_go118.go
deleted file mode 100644
index d9eaecc..0000000
--- a/counter/countertest/countertest_go118.go
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2024 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.19
-
-package countertest
-
-import "golang.org/x/telemetry/counter"
-
-func Open(telemetryDir string) {}
-
-func ReadCounter(c *counter.Counter) (count uint64, _ error) {
-	return 0, nil
-}
-
-func ReadStackCounter(c *counter.StackCounter) (stackCounts map[string]uint64, _ error) {
-	return nil, nil
-}
-
-func ReadFile(name string) (map[string]uint64, map[string]uint64, error) { return nil, nil, nil }