diff --git a/src/kernel/fs/FS.hx b/src/kernel/fs/FS.hx
index 770af27..2c0b935 100644
--- a/src/kernel/fs/FS.hx
+++ b/src/kernel/fs/FS.hx
@@ -1,5 +1,6 @@
 package kernel.fs;
 
+import haxe.ds.ReadOnlyArray;
 import kernel.fs.FileHandler.WriteBinaryHandle;
 import kernel.fs.FileHandler.ReadBinaryHandle;
 import kernel.fs.FileHandler.WriteHandle;
@@ -12,7 +13,7 @@ using lua.Table;
 	Wrapper to interact with the filesystem.
 **/
 class FS {
-	public static inline function list(path: String):Array<String> {
+	public static inline function list(path: String):ReadOnlyArray<String> {
 		return FileSystem.list(path).toArray();
 	}
 
@@ -84,7 +85,7 @@ class FS {
 		return FileSystem.open(path,BinaryAppend);
 	}
 
-	public static inline function find(pattern: String):Array<String> {
+	public static inline function find(pattern: String):ReadOnlyArray<String> {
 		return FileSystem.find(pattern).toArray();
 	}
 
diff --git a/src/kernel/peripherals/Peripherals.hx b/src/kernel/peripherals/Peripherals.hx
index 885dfc2..074abe3 100644
--- a/src/kernel/peripherals/Peripherals.hx
+++ b/src/kernel/peripherals/Peripherals.hx
@@ -1,5 +1,6 @@
 package kernel.peripherals;
 
+import haxe.ds.ReadOnlyArray;
 import kernel.peripherals.Modem;
 import kernel.peripherals.Screen;
 
@@ -36,7 +37,7 @@ class Peripheral {
 	/**
 		Get all connected screens.
 	**/
-	public function getScreens():Array<Screen> {
+	public function getScreens():ReadOnlyArray<Screen> {
 		return this.screens;
 	}
 
@@ -52,7 +53,7 @@ class Peripheral {
 	/**
 		Get all connected modems.
 	**/
-	public function getModems():Array<Modem> {
+	public function getModems():ReadOnlyArray<Modem> {
 		return this.modes;
 	}
 
@@ -68,7 +69,7 @@ class Peripheral {
 	/**
 		Get all connected drives.
 	**/
-	public function getDrives(): Array<Drive> {
+	public function getDrives(): ReadOnlyArray<Drive> {
 		return this.drives;
 	}
 
diff --git a/src/kernel/ui/WindowManager.hx b/src/kernel/ui/WindowManager.hx
index ee17284..ea5fb2d 100644
--- a/src/kernel/ui/WindowManager.hx
+++ b/src/kernel/ui/WindowManager.hx
@@ -1,5 +1,6 @@
 package kernel.ui;
 
+import haxe.ds.ReadOnlyArray;
 import kernel.ui.TermWriteable;
 import kernel.peripherals.Peripherals.Peripheral;
 
@@ -73,7 +74,7 @@ class WindowManager {
 		return newContext;
 	}
 
-	public function getOutputs():Array<String> {
+	public function getOutputs():ReadOnlyArray<String> {
 		var arr = Peripheral.instance.getScreens().map(screen -> return screen.getAddr());
 		arr.push("main");
 		return arr;