diff --git a/src/me/topchetoeu/jscript/filesystem/Filesystem.java b/src/me/topchetoeu/jscript/filesystem/Filesystem.java
index c21fb9e..2ac5e75 100644
--- a/src/me/topchetoeu/jscript/filesystem/Filesystem.java
+++ b/src/me/topchetoeu/jscript/filesystem/Filesystem.java
@@ -1,8 +1,17 @@
 package me.topchetoeu.jscript.filesystem;
 
+import me.topchetoeu.jscript.engine.Extensions;
+import me.topchetoeu.jscript.engine.values.Symbol;
+
 public interface Filesystem {
+    public static final Symbol ENV_KEY = Symbol.get("Environment.fs");
+
     String normalize(String... path);
     File open(String path, Mode mode) throws FilesystemException;
     void create(String path, EntryType type) throws FilesystemException;
     FileStat stat(String path) throws FilesystemException;
+
+    public static Filesystem get(Extensions exts) {
+        return exts.get(ENV_KEY);
+    }
 }
\ No newline at end of file
diff --git a/src/me/topchetoeu/jscript/lib/FilesystemLib.java b/src/me/topchetoeu/jscript/lib/FilesystemLib.java
index 881f5ad..2d3f62e 100644
--- a/src/me/topchetoeu/jscript/lib/FilesystemLib.java
+++ b/src/me/topchetoeu/jscript/lib/FilesystemLib.java
@@ -25,11 +25,8 @@ public class FilesystemLib {
     @Native public static final int SEEK_END = 2;
 
     private static Filesystem fs(Context ctx) {
-        var env = ctx.environment();
-        if (env != null) {
-            var fs = ctx.environment().filesystem;
-            if (fs != null) return fs;
-        }
+        var fs = Filesystem.get(ctx);
+        if (fs != null) return fs;
         throw EngineException.ofError("Current environment doesn't have a file system.");
     }