diff --git a/CEP/Demo/PSS1/rundemo b/CEP/Demo/PSS1/rundemo
index 4a103e2312e7e3d70abc9ff32ad6c68ac1fcb1f0..5cc60b466bcc56f32c47ec09bb46b722a9eb5c23 100755
--- a/CEP/Demo/PSS1/rundemo
+++ b/CEP/Demo/PSS1/rundemo
@@ -1,4 +1,7 @@
 #!/bin/sh
+RUNDEMOPATH=`echo $0 | sed 's/\/rundemo$//'`
+cd $RUNDEMOPATH
+
 AIPSROOT=%AIPSROOT%
 if test "$AIPSROOT" = "%AIPSROOT%"; then
 	AIPSROOT=/aips++/weekly