diff --git a/src/net/torvald/gdx/backends/lwjgl/audio/Opus.kt b/src/net/torvald/gdx/backends/lwjgl/audio/Opus.kt
deleted file mode 100644
index c4befa8c3..000000000
--- a/src/net/torvald/gdx/backends/lwjgl/audio/Opus.kt
+++ /dev/null
@@ -1,14 +0,0 @@
-package net.torvald.gdx.backends.lwjgl.audio
-
-import com.badlogic.gdx.backends.lwjgl.audio.OggInputStream
-import com.badlogic.gdx.backends.lwjgl.audio.OpenALAudio
-import com.badlogic.gdx.backends.lwjgl.audio.OpenALMusic
-import com.badlogic.gdx.backends.lwjgl.audio.OpenALSound
-import com.badlogic.gdx.files.FileHandle
-import com.badlogic.gdx.utils.StreamUtils
-import java.io.ByteArrayOutputStream
-
-/**
- * Created by minjaesong on 2017-06-26.
- */
-
diff --git a/src/net/torvald/gdx/backends/lwjgl/audio/OpusInputStream.java b/src/net/torvald/gdx/backends/lwjgl/audio/OpusInputStream.java
deleted file mode 100644
index a87f20edc..000000000
--- a/src/net/torvald/gdx/backends/lwjgl/audio/OpusInputStream.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package net.torvald.gdx.backends.lwjgl.audio;
-
-import org.jetbrains.annotations.NotNull;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-/**
- * Created by minjaesong on 2017-06-26.
- */
-public class OpusInputStream extends InputStream {
-    public OpusInputStream() {
-        super();
-    }
-
-    @Override
-    public int read(@NotNull byte[] b) throws IOException {
-        return super.read(b);
-    }
-
-    @Override
-    public int read(@NotNull byte[] b, int off, int len) throws IOException {
-        return super.read(b, off, len);
-    }
-
-    @Override
-    public long skip(long n) throws IOException {
-        return super.skip(n);
-    }
-
-    @Override
-    public int available() throws IOException {
-        return super.available();
-    }
-
-    @Override
-    public void close() throws IOException {
-        super.close();
-    }
-
-    @Override
-    public synchronized void mark(int readlimit) {
-        super.mark(readlimit);
-    }
-
-    @Override
-    public synchronized void reset() throws IOException {
-        super.reset();
-    }
-
-    @Override
-    public boolean markSupported() {
-        return super.markSupported();
-    }
-
-    @Override
-    public int read() throws IOException {
-        return 0;
-    }
-}