diff --git a/src/main/org/apache/tools/ant/taskdefs/defaults.properties b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
index b7342c902..3db3fd53c 100644
--- a/src/main/org/apache/tools/ant/taskdefs/defaults.properties
+++ b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
@@ -74,6 +74,7 @@ vajimport=org.apache.tools.ant.taskdefs.optional.ide.VAJImport
 telnet=org.apache.tools.ant.taskdefs.optional.net.TelnetTask
 csc=org.apache.tools.ant.taskdefs.optional.dotnet.CSharp
 ilasm=org.apache.tools.ant.taskdefs.optional.dotnet.Ilasm
+stylebook=org.apache.tools.ant.taskdefs.optional.StyleBook
 
 # deprecated ant tasks (kept for back compatibility)
 javadoc2=org.apache.tools.ant.taskdefs.Javadoc
diff --git a/src/main/org/apache/tools/ant/taskdefs/StyleBook.java b/src/main/org/apache/tools/ant/taskdefs/optional/StyleBook.java
similarity index 97%
rename from src/main/org/apache/tools/ant/taskdefs/StyleBook.java
rename to src/main/org/apache/tools/ant/taskdefs/optional/StyleBook.java
index 8d1f34713..2152243e1 100644
--- a/src/main/org/apache/tools/ant/taskdefs/StyleBook.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/StyleBook.java
@@ -51,13 +51,14 @@
  * information on the Apache Software Foundation, please see
  * <http://www.apache.org/>.
  */
-package org.apache.tools.ant.taskdefs;
+package org.apache.tools.ant.taskdefs.optional;
 
 import java.io.File; 
 import org.apache.tools.ant.BuildException; 
 import org.apache.tools.ant.types.CommandlineJava; 
 import org.apache.tools.ant.types.Path; 
 import org.apache.tools.ant.Task; 
+import org.apache.tools.ant.taskdefs.Java; 
 
 /** 
  * Basic task for apache stylebook.