diff --git a/core/src/main/java/hudson/Launcher.java b/core/src/main/java/hudson/Launcher.java
index 3947d7671e..455d57813c 100644
--- a/core/src/main/java/hudson/Launcher.java
+++ b/core/src/main/java/hudson/Launcher.java
@@ -35,7 +35,6 @@ import hudson.remoting.Pipe;
 import hudson.remoting.RemoteInputStream;
 import hudson.remoting.RemoteOutputStream;
 import hudson.remoting.VirtualChannel;
-import hudson.util.ProcessTreeKiller;
 import hudson.util.StreamCopyThread;
 import hudson.util.ArgumentListBuilder;
 import hudson.util.ProcessTree;
diff --git a/core/src/main/java/hudson/Proc.java b/core/src/main/java/hudson/Proc.java
index 35cb7cc4cc..527e606192 100644
--- a/core/src/main/java/hudson/Proc.java
+++ b/core/src/main/java/hudson/Proc.java
@@ -25,7 +25,6 @@ package hudson;
 
 import hudson.remoting.Channel;
 import hudson.util.IOException2;
-import hudson.util.ProcessTreeKiller;
 import hudson.util.StreamCopyThread;
 import hudson.util.ProcessTree;
 
diff --git a/core/src/main/java/hudson/model/Run.java b/core/src/main/java/hudson/model/Run.java
index ce582595d4..f31d2c8a91 100644
--- a/core/src/main/java/hudson/model/Run.java
+++ b/core/src/main/java/hudson/model/Run.java
@@ -48,7 +48,6 @@ import hudson.tasks.test.AbstractTestResultAction;
 import hudson.util.IOException2;
 import hudson.util.LogTaskListener;
 import hudson.util.XStream2;
-import hudson.util.ProcessTreeKiller;
 import hudson.util.ProcessTree;
 
 import java.io.BufferedReader;
diff --git a/core/src/main/java/hudson/slaves/CommandLauncher.java b/core/src/main/java/hudson/slaves/CommandLauncher.java
index becb555210..a24c0ff395 100644
--- a/core/src/main/java/hudson/slaves/CommandLauncher.java
+++ b/core/src/main/java/hudson/slaves/CommandLauncher.java
@@ -29,7 +29,6 @@ import hudson.Extension;
 import hudson.model.Descriptor;
 import hudson.model.TaskListener;
 import hudson.remoting.Channel;
-import hudson.util.ProcessTreeKiller;
 import hudson.util.StreamCopyThread;
 import hudson.util.FormValidation;
 import hudson.util.ProcessTree;
diff --git a/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java b/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
index d7870846f9..53dc391002 100644
--- a/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
+++ b/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
@@ -63,9 +63,7 @@ import hudson.tasks.Maven;
 import hudson.tasks.Ant;
 import hudson.tasks.Ant.AntInstallation;
 import hudson.tasks.Maven.MavenInstallation;
-import hudson.util.NullStream;
 import hudson.util.StreamTaskListener;
-import hudson.util.ProcessTree;
 import hudson.util.jna.GNUCLibrary;
 
 import java.io.BufferedReader;