diff --git a/src/syscall/file_emulated.go b/src/syscall/file_emulated.go
index 5ed57f13b4..8dd3bc14fc 100644
--- a/src/syscall/file_emulated.go
+++ b/src/syscall/file_emulated.go
@@ -1,4 +1,4 @@
-//go:build baremetal || (wasm && !wasip1)
+//go:build baremetal || (wasm && !wasip1) || wasm_unknown
 
 // This file emulates some file-related functions that are only available
 // under a real operating system.
diff --git a/src/syscall/file_hosted.go b/src/syscall/file_hosted.go
index d9198a779d..f448f018d7 100644
--- a/src/syscall/file_hosted.go
+++ b/src/syscall/file_hosted.go
@@ -1,4 +1,4 @@
-//go:build !(baremetal || (wasm && !wasip1))
+//go:build !(baremetal || (wasm && !wasip1) || wasm_unknown)
 
 // This file assumes there is a libc available that runs on a real operating
 // system.
diff --git a/src/syscall/syscall_nonhosted.go b/src/syscall/syscall_nonhosted.go
index 87d4d9d7b5..b56d71af64 100644
--- a/src/syscall/syscall_nonhosted.go
+++ b/src/syscall/syscall_nonhosted.go
@@ -1,4 +1,4 @@
-//go:build baremetal || js
+//go:build baremetal || js || wasm_unknown
 
 package syscall
 
diff --git a/src/syscall/tables_nonhosted.go b/src/syscall/tables_nonhosted.go
index d9f2f8654d..e66620cbf4 100644
--- a/src/syscall/tables_nonhosted.go
+++ b/src/syscall/tables_nonhosted.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build baremetal || nintendoswitch || js
+//go:build baremetal || nintendoswitch || js || wasm_unknown
 
 package syscall