diff --git a/auto_install/install.sh b/auto_install/install.sh
index 73069fa..af61cf6 100755
--- a/auto_install/install.sh
+++ b/auto_install/install.sh
@@ -743,7 +743,7 @@ confOpenVPN() {
     # Build the server
     ${SUDOE} ./build-key-server --batch $SERVER_NAME
 
-    if [ "$ENCRYPT" -ge "4096" ] && whiptail --backtitle "Setup OpenVPN" --title "Diffie-Hellman Parameters" --defaultno --yesno "Generating Diffie-Hellman parameters for a $ENCRYPT-bits key might take a long time on a Raspberry Pi. Do you want to download them? (If you're paranoid, choose 'No')" $r $c)
+    if ([ "$ENCRYPT" -ge "4096" ] && whiptail --backtitle "Setup OpenVPN" --title "Diffie-Hellman Parameters" --defaultno --yesno "Generating Diffie-Hellman parameters for a $ENCRYPT-bits key might take a long time on a Raspberry Pi. Do you want to download them? (If you're paranoid, choose 'No')" $r $c)
 then
     # Downloading parameters, $KEY_DIR and $KEY_SIZE get set by sourcing ./vars
     ${SUDOE} curl "https://2ton.com.au/dhparam/${ENCRYPT}" -o "${KEY_DIR}/dh${KEY_SIZE}.pem"