diff --git a/docs/install.sh b/docs/install.sh
index 51aed88b..c0b678a9 100755
--- a/docs/install.sh
+++ b/docs/install.sh
@@ -38,7 +38,7 @@ if [ ! -e "nixos/hosts/$TARGET_HOST/disks.nix" ]; then
 fi
 
 # Create a key for encrypted swap, if needed
-openssl rand -hex 512 > /etc/swap.key
+sudo echo -n "$(head -c32 /dev/random | base64)" > /etc/swap.key
 
 echo "WARNING! The disks in $TARGET_HOST are about to get wiped"
 echo "         NixOS will be re-installed"