diff --git a/2018/burton2/spotcheck.sh b/2018/burton2/spotcheck.sh
index 117503470..a0936bac4 100755
--- a/2018/burton2/spotcheck.sh
+++ b/2018/burton2/spotcheck.sh
@@ -1,26 +1,26 @@
 #!/usr/bin/env bash
 
-ioc=$1
-: ${iocccsize:=iocccsize}
-: ${ioc:=prog}
+ioc="$1"
+: "${iocccsize:=iocccsize}"
+: "${ioc:=prog}"
 
 opt=-crs
 kopt=-kcrs
 
-for name in $*; do
+for name in "$@"; do
 	
-	if test $name != $ioc; then
+	if test "$name" != "$ioc"; then
 
-	a=$($ioc $opt < $name 2>&1)
-	b=$($iocccsize $opt < $name 2>&1)
+	a=$("$ioc" "$opt" < "$name" 2>&1)
+	b=$("$iocccsize" "$opt" < "$name" 2>&1)
 	if test "$a" != "$b"; then
-		echo $a , $b , $name
+		echo "$a" , "$b" , "$name"
 	fi
 
-	a=$($ioc $kopt < $name 2>&1)
-	b=$($iocccsize $kopt < $name 2>&1)
+	a=$("$ioc" "$kopt" < "$name" 2>&1)
+	b=$("$iocccsize" "$kopt" < "$name" 2>&1)
 	if test "$a" != "$b"; then
-		echo $a , $b , $name " keep"
+		echo "$a" , "$b" , "$name" " keep"
 	fi
 
 	fi