diff --git a/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeEditorSynchronizer.kt b/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeEditorSynchronizer.kt
index c4badb5419af..bc80f09b642e 100644
--- a/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeEditorSynchronizer.kt
+++ b/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeEditorSynchronizer.kt
@@ -17,7 +17,7 @@ import com.intellij.ui.content.Content
  * automatically switch to the corresponding bytecode in the bytecode viewer.
  */
 @Service(Service.Level.PROJECT)
-class BytecodeEditorSynchronizer(private val project: Project) : FileEditorManagerListener {
+internal class BytecodeEditorSynchronizer(private val project: Project) : FileEditorManagerListener {
 
   /**
    * Called when the selected editor changes.
diff --git a/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeToolWindowService.kt b/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeToolWindowService.kt
index d60c342532e5..89d2d98b55f5 100644
--- a/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeToolWindowService.kt
+++ b/plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/BytecodeToolWindowService.kt
@@ -19,7 +19,7 @@ import java.util.concurrent.ConcurrentHashMap
  * and properly unregistered when the project is disposed.
  */
 @Service(Service.Level.PROJECT)
-class BytecodeToolWindowService(private val project: Project) {
+internal class BytecodeToolWindowService(private val project: Project) {
   private val registeredListeners = ConcurrentHashMap<ToolWindow, ContentManagerListener>()
 
   /**