diff --git a/build.xml b/build.xml
index 481cee5e1..307381fab 100644
--- a/build.xml
+++ b/build.xml
@@ -210,6 +210,7 @@
         <srcfiles dir="src/as" includes="**/*.as"/>
         <srcfiles dir="src/as" includes="**/Environment.as-tm"/>
         <srcfiles dir="etc" includes="asc-files.txt"/>
+        <srcfiles dir="lib" includes="*.abc"/>
       </uptodate>
     </condition>
   </target>