diff --git a/compact/gem_tracker_endcap.xml b/compact/gem_tracker_endcap.xml
index 1430ff5625d009080f3527256a676f348239c69a..516405f371769bc34e7a28abcfcc12d36b66d68a 100644
--- a/compact/gem_tracker_endcap.xml
+++ b/compact/gem_tracker_endcap.xml
@@ -57,7 +57,7 @@
   <readouts>
     <readout name="GEMTrackerEndcapHits">
       <segmentation type="CartesianGridXY" grid_size_x="1.0*mm" grid_size_y="1.0*mm" />
-      <id>system:8,barrel:3,layer:4,x:32:-16,y:-16</id>  
+      <id>system:8,barrel:2,layer:4,module:12,sensor:2,x:32:-16,y:-16</id>
     </readout>
   </readouts>