Simplify
diff --git a/src/main/java/org/apache/commons/io/input/ReaderInputStream.java b/src/main/java/org/apache/commons/io/input/ReaderInputStream.java
index 7e5bee6..e4d9c0f 100644
--- a/src/main/java/org/apache/commons/io/input/ReaderInputStream.java
+++ b/src/main/java/org/apache/commons/io/input/ReaderInputStream.java
@@ -138,7 +138,7 @@
         public Builder setCharsetEncoder(final CharsetEncoder charsetEncoder) {
             this.charsetEncoder = charsetEncoder;
             super.setCharset(charsetEncoder.charset());
-            return asThis();
+            return this;
         }
 
     }