diff --git a/PARAM/SHMS/DC/pdc_geom.param b/PARAM/SHMS/DC/pdc_geom.param
index cd05a5be8292ca3131dd3c4c85a4bddc1ea359cb..80ec5ff987d735cd009d9419ff6eafe507524fbe 100644
--- a/PARAM/SHMS/DC/pdc_geom.param
+++ b/PARAM/SHMS/DC/pdc_geom.param
@@ -44,8 +44,8 @@ pdc_readoutTB = 1, -1, 1, -1, 1, -1
 
 ; x, y and z position of center for each wire chamber in cm.
 ; From survey C1771.
-pdc_xcenter = -0.036, 0.008 ;
-pdc_ycenter = 0.019, 0.013 ;
+pdc_xcenter = -0.036, 0.008;
+pdc_ycenter = 0.019-0.613, 0.013-0.613 ;
 
 pdc_1_zpos = -40 - 0.656 ;
 pdc_2_zpos =  40 - 0.668 ;