diff --git a/2018/burton1/scripthd.sh b/2018/burton1/scripthd.sh
index de09af623..4a9ee45ac 100755
--- a/2018/burton1/scripthd.sh
+++ b/2018/burton1/scripthd.sh
@@ -2,7 +2,7 @@
 
 hd=${HD:=./prog}
 
-cat $* |
+cat "$@" |
 $hd |
 awk '
 BEGIN { nodup=1; group=1 }