diff --git a/iso/dgn-install/dgn-install.sh b/iso/dgn-install/dgn-install.sh
index 2856d0a..ae7d179 100644
--- a/iso/dgn-install/dgn-install.sh
+++ b/iso/dgn-install/dgn-install.sh
@@ -56,7 +56,7 @@ mkdir /mnt/boot
 
 mount "$bootDevice" /mnt/boot
 
-if [ "x$swapDevice" != "x" ]; then
+if [ -n "$swapDevice" ]; then
   swapon "$swapDevice"
 fi