diff --git a/core/src/main/java/hudson/Util.java b/core/src/main/java/hudson/Util.java
index bedd305a867c982c4d5a5caa401d356454357ff4..593c44b60125d108dedd71448897302dcd3099e6 100644
--- a/core/src/main/java/hudson/Util.java
+++ b/core/src/main/java/hudson/Util.java
@@ -26,8 +26,6 @@ import java.io.OutputStreamWriter;
 import java.io.Reader;
 import java.io.Writer;
 import java.io.PrintStream;
-import java.io.StringWriter;
-import java.io.PrintWriter;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.net.URI;