diff --git a/src/main/org/apache/tools/ant/taskdefs/defaults.properties b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
index 02f9758f0..b9e33aea2 100644
--- a/src/main/org/apache/tools/ant/taskdefs/defaults.properties
+++ b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
@@ -58,6 +58,7 @@ mparse=org.apache.tools.ant.taskdefs.optional.metamata.MParse
 junit=org.apache.tools.ant.taskdefs.optional.junit.JUnitTask
 cab=org.apache.tools.ant.taskdefs.optional.Cab
 ftp=org.apache.tools.ant.taskdefs.optional.net.FTP
+icontract=org.apache.tools.ant.taskdefs.optional.IContract
 javacc=org.apache.tools.ant.taskdefs.optional.javacc.JavaCC
 jjtree=org.apache.tools.ant.taskdefs.optional.javacc.JJTree
 starteam=org.apache.tools.ant.taskdefs.optional.scm.AntStarTeamCheckOut