diff --git a/src/main/org/apache/tools/ant/types/defaults.properties b/src/main/org/apache/tools/ant/types/defaults.properties
index f52da372e..fbaed1781 100644
--- a/src/main/org/apache/tools/ant/types/defaults.properties
+++ b/src/main/org/apache/tools/ant/types/defaults.properties
@@ -13,4 +13,5 @@ regexp=org.apache.tools.ant.types.RegularExpression
 substitution=org.apache.tools.ant.types.Substitution
 xmlcatalog=org.apache.tools.ant.types.XMLCatalog
 extensionSet=org.apache.tools.ant.taskdefs.optional.extension.ExtensionSet
-extension=org.apache.tools.ant.taskdefs.optional.extension.ExtensionAdapter
\ No newline at end of file
+extension=org.apache.tools.ant.taskdefs.optional.extension.ExtensionAdapter
+libfileset=org.apache.tools.ant.taskdefs.optional.extension.LibFileSet
\ No newline at end of file