diff --git a/contrib/kiss-size b/contrib/kiss-size
index e8314ce..b98d805 100755
--- a/contrib/kiss-size
+++ b/contrib/kiss-size
@@ -27,7 +27,8 @@ kiss list "${1:-null}" >/dev/null || {
 
 # Filter directories from manifest and leave only files.
 # Directories in the manifest end in a trailing '/'.
-files=$(sed 's|.*/$||' "$KISS_ROOT/var/db/kiss/installed/$1/manifest")
+files=$(sed -e "s|^|$KISS_ROOT|" -e 's|.*/$||' \
+    "$KISS_ROOT/var/db/kiss/installed/$1/manifest")
 
 # Send the file list to 'du'.
 # This unquoted variable is safe as word splitting is intended