diff --git a/compact/definitions.xml b/compact/definitions.xml
index 67498d1c256e3ada6bb963b4ec95a6f0c3e0a34d..30eeee475159617fb2f6051cd0d1174c46381772 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -339,8 +339,8 @@
 
     
     <constant name="cb_VTX_rmin"   value="33.0*mm"/>
-    <constant name="cb_VTX_rmax"   value="167.0*mm"/>
-    <constant name="cb_VTX_length" value="300.0*mm"/>
+    <constant name="cb_VTX_rmax"   value="165.0*mm"/>
+    <constant name="cb_VTX_length" value="500.0*mm"/>
 
     <constant name="cb_VTX_x_pos"   value="0.0*mm"/>
     <constant name="cb_VTX_y_pos"   value="0.0*mm"/>