diff --git a/core/src/main/java/hudson/model/Computer.java b/core/src/main/java/hudson/model/Computer.java
index 3cb7618ed3a9..c66759f94ab9 100644
--- a/core/src/main/java/hudson/model/Computer.java
+++ b/core/src/main/java/hudson/model/Computer.java
@@ -100,7 +100,6 @@
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 import java.util.logging.LogRecord;
 import java.util.logging.Logger;
@@ -115,7 +114,6 @@
 import jenkins.util.ErrorLoggingExecutorService;
 import jenkins.util.Listeners;
 import jenkins.util.SystemProperties;
-import jenkins.util.Timer;
 import jenkins.widgets.HasWidgets;
 import net.jcip.annotations.GuardedBy;
 import org.jenkins.ui.icon.Icon;