src/java.desktop/share/classes/javax/sound/sampled/AudioInputStream.java

@@ -58,11 +58,11 @@
 
     /**
      * The {@code InputStream} from which this {@code AudioInputStream} object
      * was constructed.
      */
-    private InputStream stream;
+    private final InputStream stream;
 
     /**
      * The format of the audio data contained in the stream.
      */
     protected AudioFormat format;