diff --git a/compact/hcal.xml b/compact/hcal.xml
index 27bf87f9bb2d68eee121c66bf122847fff362ad7..01e84d17bde5a2adb04f92d7996ef1d51071268b 100644
--- a/compact/hcal.xml
+++ b/compact/hcal.xml
@@ -135,7 +135,7 @@
   <!--  Definition of the readout segmentation/definition  -->
   <readouts>
     <readout name="HcalBarrelHits">
-      <segmentation type="CartesianGridXY" grid_size_x="100* mm" grid_size_y="100 * mm"/>
+      <segmentation type="CartesianGridXY" grid_size_x="250 * mm" grid_size_y="250 * mm"/>
       <id>system:8,barrel:3,module:4,layer:8,slice:5,x:32:-16,y:-16</id>
     </readout>
     <readout name="HcalEndcapPHits">