diff --git a/snapper-post b/snapper-post
index e94bc15..95be55a 100755
--- a/snapper-post
+++ b/snapper-post
@@ -26,16 +26,15 @@ else
     echo "WARNING: /etc/snap-pac.conf is missing. Using default settings."
 fi
 
-cleanupalgo=${CLEANUP_ALGORITHM:-"number"}
-description=${POST_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
-configurations=${CONFIGS:-"root"}
-PREFILE_PREFIX="/usr/share/libalpm/hooks.bin/snap-pac/.pre"
+declare -r cleanupalgo=${CLEANUP_ALGORITHM:-"number"}
+declare -r description=${POST_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
+declare -r configurations=${CONFIGS:-"root"}
+declare -r prefile_prefix="/usr/share/libalpm/hooks.bin/snap-pac/.pre"
 for x in $configurations; do
-    if [ -f $PREFILE_PREFIX"_"$x ]; then
-        SNAPPERPACPRE=$(cat $PREFILE_PREFIX"_"$x)
-        snapper --config $x create --cleanup-algorithm $cleanupalgo --type post --pre-number $SNAPPERPACPRE --description "$description"
-        rm $PREFILE_PREFIX"_"$x
+    if [ -f $prefile_prefix"_"$x ]; then
+        snapper --config $x create --cleanup-algorithm $cleanupalgo --type post --pre-number $(cat $prefile_prefix"_"$x) --description "$description"
+        rm $prefile_prefix"_"$x
     else
-        echo "WARNING: $PREFILE_PREFIX"_"$x does not exist, so no post snapshot will be taken. If you are initially installing snap-pac, this is normal."
+        echo "WARNING: $prefile_prefix"_"$x does not exist, so no post snapshot will be taken. If you are initially installing snap-pac, this is normal."
     fi
 done
diff --git a/snapper-pre b/snapper-pre
index 6240f2d..1cb363e 100755
--- a/snapper-pre
+++ b/snapper-pre
@@ -26,10 +26,10 @@ else
     echo "WARNING: /etc/snap-pac.conf is missing. Using default settings."
 fi
 
-cleanupalgo=${CLEANUP_ALGORITHM:-"number"}
-description=${POST_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
-configurations=${CONFIGS:-"root"}
-PREFILE_PREFIX="/usr/share/libalpm/hooks.bin/snap-pac/.pre"
+declare -r cleanupalgo=${CLEANUP_ALGORITHM:-"number"}
+declare -r description=${POST_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
+declare -r configurations=${CONFIGS:-"root"}
+declare -r prefile_prefix="/usr/share/libalpm/hooks.bin/snap-pac/.pre"
 for x in $configurations; do
-    snapper --config $x create --type pre --cleanup-algorithm $cleanupalgo --print-number --description "$description" > $PREFILE_PREFIX"_"$x
+    snapper --config $x create --type pre --cleanup-algorithm $cleanupalgo --print-number --description "$description" > $prefile_prefix"_"$x
 done