diff --git a/contrib/pacsysclean.sh.in b/contrib/pacsysclean.sh.in
index 8f2eea3..85d5025 100644
--- a/contrib/pacsysclean.sh.in
+++ b/contrib/pacsysclean.sh.in
@@ -34,33 +34,33 @@ if [ -n "$1" ]; then
 	esac
 fi
 
-IFS=$'\n'
-name="^Name.*: (.*)$"
-size="^Installed Size.*: (.*) KiB$"
-
 [[ $PACMAN_OPTS && $PACMAN_OPTS != -* ]] && PACMAN_OPTS="-$PACMAN_OPTS"
 
-for line in $(LANG=C pacman -Qi $PACMAN_OPTS); do
-	if [[ $line =~ $name ]]; then
-		printf "%s\t" ${BASH_REMATCH[1]}
-	elif [[ $line =~ $size ]]; then
-		printf "%s\n" ${BASH_REMATCH[1]}
-	fi
-done | sort -g -k2 | awk '
+LANG=C pacman -Qi $PACMAN_OPTS | gawk '
 BEGIN {
+	PROCINFO["sorted_in"] = "@ind_num_asc"
 	split("KiB MiB GiB TiB PiB EiB ZiB YiB", suffix)
 }
 function format_size(size) {
 	count = 1
 	while (size + 0 > 1024) {
-				 size /= 1024
-				 count++
+		size /= 1024
+		count++
 	}
 	sizestr = sprintf("%.2f %s", size, suffix[count])
 	return sizestr
 }
-{
-	printf("%s\t%s\n", format_size($2), $1);
+/^Name.*:/ {
+	name = $NF
+}
+/^Installed Size.*:/ {
+	size = $(NF - 1)
+	sizes[size] = sizes[size] ? sizes[size] "," name : name
+}
+END {
+	for (size in sizes) {
+		printf("%s\t%s\n", format_size(size), sizes[size]);
+	}
 }'
 
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