diff --git a/build.xml b/build.xml
index 3f38ec258..a6dc99568 100644
--- a/build.xml
+++ b/build.xml
@@ -742,6 +742,7 @@ MSIL
         <not>
           <present targetdir="${src.dir}/dotnet-library"/>
         </not>
+        <exclude name="scala/collection/jcl/**/*.scala"/>
       </fileset>
     </copy>