diff --git a/src/main/org/apache/tools/ant/taskdefs/defaults.properties b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
index 2f547e508..54ea31fbe 100644
--- a/src/main/org/apache/tools/ant/taskdefs/defaults.properties
+++ b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
@@ -72,6 +72,7 @@ cvstagdiff=org.apache.tools.ant.taskdefs.cvslib.CvsTagDiff
 tempfile=org.apache.tools.ant.taskdefs.TempFile
 classloader=org.apache.tools.ant.taskdefs.Classloader
 import=org.apache.tools.ant.taskdefs.ImportTask
+whichresource=org.apache.tools.ant.taskdefs.WhichResource
 
 # optional tasks
 image=org.apache.tools.ant.taskdefs.optional.image.Image