diff --git a/setup.csh b/setup.csh
index 3eccf7fd99e95de779865f9c6f635d1a502268b0..83155fcf76c9e87bf4d5570f22f93515dd620284 100644
--- a/setup.csh
+++ b/setup.csh
@@ -11,7 +11,7 @@ set MYDIR=`cd $MYDIR && pwd`    # ensure absolute path
 setenv ANALYZER $MYDIR/podd
 setenv HCANALYZER $MYDIR
 # Check if LD_LIBRARY_PATH is defined
-if ( $LD_LIBRARY_PATH == "" ) then
+if ( ! ($?LD_LIBRARY_PATH) ) then
    setenv LD_LIBRARY_PATH ""
 endif
 setenv LD_LIBRARY_PATH "${LD_LIBRARY_PATH}:${ANALYZER}:${HCANALYZER}"