diff --git a/classpath/java/io/Reader.java b/classpath/java/io/Reader.java
index acbf42ffd2..a09c8a24e9 100644
--- a/classpath/java/io/Reader.java
+++ b/classpath/java/io/Reader.java
@@ -28,5 +28,17 @@ public abstract class Reader {
   public abstract int read(char[] buffer, int offset, int length)
     throws IOException;
 
+  public boolean markSupported() {
+    return false;
+  }
+  
+  public void mark(int readAheadLimit) throws IOException {
+    throw new IOException("mark not supported");
+  }
+  
+  public void reset() throws IOException {
+    throw new IOException("reset not supported");
+  }
+
   public abstract void close() throws IOException;
 }