diff --git a/start_MEDM_xxx b/start_MEDM_xxx
index 547009c8d85bf2135fd3897529eba97d8b908067..07025715165dedd595a3f78b8b10d44d7f4dc847 100755
--- a/start_MEDM_xxx
+++ b/start_MEDM_xxx
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-export EPICS_APP=`dirname $BASH_SOURCE`
+export EPICS_APP=`dirname $0`
 export EPICS_APP_ADL_DIR=${EPICS_APP}/xxxApp/op/adl
 export DEFAULT_UI_FILE=${DEFAULT_UI_FILE:-xxx.adl}