diff --git a/pacman-zfs-snapshot.sh b/pacman-zfs-snapshot.sh
index e6c501e..286d7c5 100755
--- a/pacman-zfs-snapshot.sh
+++ b/pacman-zfs-snapshot.sh
@@ -5,6 +5,9 @@ while read pkg; do
     pkgs+=("${pkg}")
 done
 
+declare operation
+operation="${1}"
+
 declare conf_file
 conf_file='/etc/pacman-zfs-snapshot.conf'