diff --git a/i3/terminal.sh b/i3/terminal.sh
index 8eb2854..2c404d3 100755
--- a/i3/terminal.sh
+++ b/i3/terminal.sh
@@ -5,7 +5,7 @@ set -uo pipefail
 set +e
 
 #CMD=i3-sensible-terminal
-if [ -n "$WAYLAND_DISPLAY" ]; then
+if [ -n "${WAYLAND_DISPLAY:-}" ]; then
 	CMD=foot
 else
 	CMD=xfce4-terminal