diff --git a/dnsapi/dns_da_ef.sh b/dnsapi/dns_da_ef.sh
index b3e0b125d5..b26b497a8b 100644
--- a/dnsapi/dns_da_ef.sh
+++ b/dnsapi/dns_da_ef.sh
@@ -31,8 +31,8 @@
 # Usage: dns_da_ef_add  _acme-challenge.www.example.com  "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
 # Used to add txt record
 dns_da_ef_add() {
-  fulldomain="${1}"
-  txtvalue="${2}"
+  fulldomain="$1"
+  txtvalue="$2"
   _debug "Calling: dns_da_ef_add() '${fulldomain}' '${txtvalue}'"
   _DA_credentials && _DA_getDomainInfo && _DA_addTxt
 }
@@ -40,8 +40,8 @@ dns_da_ef_add() {
 # Usage: dns_da_ef_rm  _acme-challenge.www.example.com  "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
 # Used to remove the txt record after validation
 dns_da_ef_rm() {
-  fulldomain="${1}"
-  txtvalue="${2}"
+  fulldomain="$1"
+  txtvalue="$2"
   _debug "Calling: dns_da_ef_rm() '${fulldomain}' '${txtvalue}'"
   _DA_credentials && _DA_getDomainInfo && _DA_rmTxt
 }