diff --git a/athena.xml b/athena.xml
index 7a38fe7a460cb64b19ea5796567b63c581770c58..a0d887d3cf2dc89b4046b8018a4380dab6511171 100644
--- a/athena.xml
+++ b/athena.xml
@@ -172,7 +172,7 @@
   <documentation level="10">
   ### PID detectors
   </documentation>
-  <!--include ref="compact/pid_config_acadia.xml" /-->
+  <include ref="compact/pid_config_acadia.xml" />
 
   <documentation level="10">
   ## Central calorimetry