diff --git a/sample/src/androidMain/kotlin/Platform.android.kt b/sample/src/androidMain/kotlin/Platform.android.kt
index 4f3ea05..1d3e065 100644
--- a/sample/src/androidMain/kotlin/Platform.android.kt
+++ b/sample/src/androidMain/kotlin/Platform.android.kt
@@ -1,6 +1,6 @@
 import android.os.Build
 
-class AndroidPlatform : Platform {
+private class AndroidPlatform : Platform {
     override val name: String = "Android ${Build.VERSION.SDK_INT}"
 }
 
diff --git a/sample/src/androidMain/kotlin/be/digitalia/compose/htmlconverter/sample/MainActivity.kt b/sample/src/androidMain/kotlin/be/digitalia/compose/htmlconverter/sample/MainActivity.kt
index b625d49..a913c02 100644
--- a/sample/src/androidMain/kotlin/be/digitalia/compose/htmlconverter/sample/MainActivity.kt
+++ b/sample/src/androidMain/kotlin/be/digitalia/compose/htmlconverter/sample/MainActivity.kt
@@ -21,6 +21,6 @@ class MainActivity : ComponentActivity() {
 
 @Preview(showSystemUi = true)
 @Composable
-fun AppAndroidPreview() {
+private fun AppAndroidPreview() {
     App()
 }
\ No newline at end of file
diff --git a/sample/src/desktopMain/kotlin/Platform.jvm.kt b/sample/src/desktopMain/kotlin/Platform.jvm.kt
index f5e7e49..75bfd3f 100644
--- a/sample/src/desktopMain/kotlin/Platform.jvm.kt
+++ b/sample/src/desktopMain/kotlin/Platform.jvm.kt
@@ -1,4 +1,4 @@
-class JVMPlatform: Platform {
+private class JVMPlatform: Platform {
     override val name: String = "Java ${System.getProperty("java.version")}"
 }
 
diff --git a/sample/src/desktopMain/kotlin/main.kt b/sample/src/desktopMain/kotlin/main.kt
index 97fb974..8152bd8 100644
--- a/sample/src/desktopMain/kotlin/main.kt
+++ b/sample/src/desktopMain/kotlin/main.kt
@@ -11,6 +11,6 @@ fun main() = application {
 
 @Preview
 @Composable
-fun AppDesktopPreview() {
+private fun AppDesktopPreview() {
     App()
 }
\ No newline at end of file
diff --git a/sample/src/iosMain/kotlin/Platform.ios.kt b/sample/src/iosMain/kotlin/Platform.ios.kt
index 6b9f070..5f4464b 100644
--- a/sample/src/iosMain/kotlin/Platform.ios.kt
+++ b/sample/src/iosMain/kotlin/Platform.ios.kt
@@ -1,6 +1,6 @@
 import platform.UIKit.UIDevice
 
-class IOSPlatform: Platform {
+private class IOSPlatform: Platform {
     override val name: String = UIDevice.currentDevice.systemName() + " " + UIDevice.currentDevice.systemVersion
 }