diff --git a/include/chromebook.sh b/include/chromebook.sh
index 75e445fc..170af881 100644
--- a/include/chromebook.sh
+++ b/include/chromebook.sh
@@ -118,12 +118,14 @@ prep_mr_file()
 
 	while [ $# -gt 0 ]
 	do
-		if [ -f "$2" ]; then
-			printf "%s\n" "$1" >> "$2" || \
-			    err "Can't write '$1' to '$2'" "mr_file" "$@"
+		if [ -f "$mr_filename" ]; then
+			printf "%s\n" "$1" >> "$mr_filename" || \
+			    err "Can't write '$1' to '$mr_filename'" \
+			    "prep_mr_file" "$@"
 		else
-			printf "%s\n" "$1" > "$2" || \
-			    err "Can't write '$1' to '$2'" "mr_file" "$@"
+			printf "%s\n" "$1" > "$mr_filename" || \
+			    err "Can't write '$1' to '$mr_filename'" \
+			    "prep_mr_file" "$@"
 		fi
 		shift 1
 	done