diff --git a/compact/definitions.xml b/compact/definitions.xml
index e758c692c7f5df042f7393c44e7c4e1887aa494a..e3914fa9f42f21e04618b0878357e885c598451e 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -481,7 +481,7 @@
     <constant name="ci_HCAL_posz"    value="0 * cm"/>
    
     <constant name="ci_HCAL_nlayers"       value="20"/>
-    <constant name="ci_HCAL_lay_rin"       value="80 * cm"/>
+    <constant name="ci_HCAL_lay_rin"       value="76 * cm"/> <!-- Original = 80cm -->
     <constant name="ci_HCAL_lay_rout"      value="ci_HCAL_rout - 1 * cm"/>
     <constant name="ci_HCAL_lay_thickness" value="2* cm"/>
     <constant name="ci_HCAL_lay_gapz"      value="2* cm"/>