diff --git a/pom.xml b/pom.xml
index 4471c2f..765966f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -385,6 +385,7 @@
                             <Build-Time>${maven.build.timestamp}</Build-Time>
                         </manifestEntries>
                     </archive>
+                    <attachClasses>true</attachClasses>
                     <overlays>
                         <overlay>
                             <groupId>ca.uhn.hapi.fhir</groupId>