diff --git a/dnsapi/dns_cyon.sh b/dnsapi/dns_cyon.sh
index 8db3011d..2dca90c0 100644
--- a/dnsapi/dns_cyon.sh
+++ b/dnsapi/dns_cyon.sh
@@ -66,7 +66,7 @@ _cyon_load_credentials() {
   _debug "Save credentials to account.conf"
   _saveaccountconf CY_Username "${CY_Username}"
   _saveaccountconf CY_Password_B64 "$CY_Password_B64"
-  if [ ! -z "${CY_OTP_Secret}" ]; then
+  if [ -n "${CY_OTP_Secret}" ]; then
     _saveaccountconf CY_OTP_Secret "$CY_OTP_Secret"
   else
     _clearaccountconf CY_OTP_Secret
@@ -164,7 +164,7 @@ _cyon_login() {
   # todo: instead of just checking if the env variable is defined, check if we actually need to do a 2FA auth request.
 
   # 2FA authentication with OTP?
-  if [ ! -z "${CY_OTP_Secret}" ]; then
+  if [ -n "${CY_OTP_Secret}" ]; then
     _info "  - Authorising with OTP code..."
 
     if ! _exists oathtool; then