diff --git a/src/os/file_anyos.go b/src/os/file_anyos.go
index 04ee6301..225b72f5 100644
--- a/src/os/file_anyos.go
+++ b/src/os/file_anyos.go
@@ -26,8 +26,6 @@ var (
 	Stderr = NewFile(uintptr(syscall.Stderr), "/dev/stderr")
 )
 
-const DevNull = "/dev/null"
-
 // isOS indicates whether we're running on a real operating system with
 // filesystem support.
 const isOS = true
diff --git a/src/os/file_other.go b/src/os/file_other.go
index a96c0540..9206d343 100644
--- a/src/os/file_other.go
+++ b/src/os/file_other.go
@@ -15,6 +15,8 @@ var (
 	Stderr = NewFile(2, "/dev/stderr")
 )
 
+const DevNull = "/dev/null"
+
 // isOS indicates whether we're running on a real operating system with
 // filesystem support.
 const isOS = false
diff --git a/src/os/file_unix.go b/src/os/file_unix.go
index cc257d7e..a76f5ff1 100644
--- a/src/os/file_unix.go
+++ b/src/os/file_unix.go
@@ -1,6 +1,9 @@
 //go:build darwin || (linux && !baremetal)
 // +build darwin linux,!baremetal
 
+// target wasi sets GOOS=linux and thus the +linux build tag,
+// even though it doesn't show up in "tinygo info target -wasi"
+
 // Portions copyright 2009 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.
@@ -12,6 +15,8 @@ import (
 	"syscall"
 )
 
+const DevNull = "/dev/null"
+
 type syscallFd = int
 
 // fixLongPath is a noop on non-Windows platforms.
diff --git a/src/os/file_windows.go b/src/os/file_windows.go
index 694b1394..a26cfd2a 100644
--- a/src/os/file_windows.go
+++ b/src/os/file_windows.go
@@ -13,6 +13,8 @@ import (
 	"unicode/utf16"
 )
 
+const DevNull = "NUL"
+
 type syscallFd = syscall.Handle
 
 // Symlink is a stub, it is not implemented.