diff --git a/src/main/java/org/apache/commons/compress/harmony/unpack200/Pack200UnpackerAdapter.java b/src/main/java/org/apache/commons/compress/harmony/unpack200/Pack200UnpackerAdapter.java
index ebed34cb947..cbde81642b4 100644
--- a/src/main/java/org/apache/commons/compress/harmony/unpack200/Pack200UnpackerAdapter.java
+++ b/src/main/java/org/apache/commons/compress/harmony/unpack200/Pack200UnpackerAdapter.java
@@ -157,16 +157,6 @@ static InputStream unwrap(final FilterInputStream filterInputStream) {
         return readField(filterInputStream, "in");
     }
 
-    /**
-     * Unwraps the given InputStream if it is an FilterInputStream to return its wrapped InputStream.
-     *
-     * @param inputStream The FilterInputStream to unwrap.
-     * @return The wrapped InputStream
-     */
-    static InputStream unwrap(final InputStream inputStream) {
-        return inputStream instanceof FilterInputStream ? unwrap((FilterInputStream) inputStream) : inputStream;
-    }
-
     /**
      * Constructs a new Pack200UnpackerAdapter.
      */