diff --git a/fs/copy.ts b/fs/copy.ts
index c481c0223968..b4602ff6a351 100644
--- a/fs/copy.ts
+++ b/fs/copy.ts
@@ -8,7 +8,8 @@ import { getFileInfoType } from "./_get_file_info_type.ts";
 import { toPathString } from "./_to_path_string.ts";
 import { isSubdir } from "./_is_subdir.ts";
 
-const isWindows = Deno.build.os === "windows";
+// deno-lint-ignore no-explicit-any
+const isWindows = (globalThis as any).Deno?.build.os === "windows";
 
 /** Options for {@linkcode copy} and {@linkcode copySync}. */
 export interface CopyOptions {
diff --git a/fs/ensure_symlink.ts b/fs/ensure_symlink.ts
index 8e27d6c436cc..f2dec2cd9ea7 100644
--- a/fs/ensure_symlink.ts
+++ b/fs/ensure_symlink.ts
@@ -5,7 +5,8 @@ import { ensureDir, ensureDirSync } from "./ensure_dir.ts";
 import { getFileInfoType, type PathType } from "./_get_file_info_type.ts";
 import { toPathString } from "./_to_path_string.ts";
 
-const isWindows = Deno.build.os === "windows";
+// deno-lint-ignore no-explicit-any
+const isWindows = (globalThis as any).Deno?.build.os === "windows";
 
 function resolveSymlinkTarget(target: string | URL, linkName: string | URL) {
   if (typeof target !== "string") return target; // URL is always absolute path
diff --git a/fs/eol.ts b/fs/eol.ts
index 25218f5798e8..dfa0d4bba8ee 100644
--- a/fs/eol.ts
+++ b/fs/eol.ts
@@ -16,7 +16,9 @@ export const CRLF = "\r\n" as const;
  * EOL; // "\n" on POSIX platforms and "\r\n" on Windows
  * ```
  */
-export const EOL: "\n" | "\r\n" = Deno?.build.os === "windows" ? CRLF : LF;
+export const EOL: "\n" | "\r\n" =
+  // deno-lint-ignore no-explicit-any
+  (globalThis as any).Deno?.build.os === "windows" ? CRLF : LF;
 
 const regDetect = /(?:\r?\n)/g;
 
diff --git a/fs/expand_glob.ts b/fs/expand_glob.ts
index fb0b24d3da41..5cffba1bba2b 100644
--- a/fs/expand_glob.ts
+++ b/fs/expand_glob.ts
@@ -15,7 +15,8 @@ import {
 
 export type { GlobOptions, WalkEntry };
 
-const isWindows = Deno.build.os === "windows";
+// deno-lint-ignore no-explicit-any
+const isWindows = (globalThis as any).Deno?.build.os === "windows";
 
 /** Options for {@linkcode expandGlob} and {@linkcode expandGlobSync}. */
 export interface ExpandGlobOptions extends Omit<GlobOptions, "os"> {