diff --git a/bin/random_wallpaper b/bin/random_wallpaper
index 5111ebd..2220311 100755
--- a/bin/random_wallpaper
+++ b/bin/random_wallpaper
@@ -7,6 +7,7 @@
 directory="$HOME/wallpapers"
 minutes=15
 PROGRAM=`which feh`
+is_wayland=false
 
 # Some tests
 if [[ "${XDG_SESSION_TYPE}" == "wayland" ]]; then
@@ -15,7 +16,7 @@ if [[ "${XDG_SESSION_TYPE}" == "wayland" ]]; then
     echo "This script needs the swaymsg program."
     exit 1
   fi
-  wayland=1
+  is_wayland=true
 elif [ -z "${PROGRAM}" ]; then
   echo "This script needs the feh program. Install it."
   exit 1
@@ -48,7 +49,7 @@ while true; do
 
   # Change background
   file="${array_files["$NUMBER"]}"
-  if [[ -n wayland ]]; then
+  if "${is_wayland}"; then
     $PROGRAM output "*" bg "$directory/$file" fill
   else
     feh --bg-fill "$directory/$file"