diff --git a/dnsapi/dns_aws.sh b/dnsapi/dns_aws.sh
index 4fab09e..a3d0082 100755
--- a/dnsapi/dns_aws.sh
+++ b/dnsapi/dns_aws.sh
@@ -20,10 +20,10 @@ AWS_WIKI="https://github.com/Neilpang/acme.sh/wiki/How-to-use-Amazon-Route53-API
 dns_aws_add() {
   fulldomain=$1
   txtvalue=$2
-  slowrateslepp=$AWS_DNS_SLOWRATE
 
   AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
   AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
+  AWS_DNS_SLOWRATE="${AWS_DNS_SLOWRATE:-$(_readaccountconf_mutable AWS_DNS_SLOWRATE)}"
 
   if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
     _use_container_role || _use_instance_role
@@ -41,6 +41,7 @@ dns_aws_add() {
   if [ -z "$_using_role" ]; then
     _saveaccountconf_mutable AWS_ACCESS_KEY_ID "$AWS_ACCESS_KEY_ID"
     _saveaccountconf_mutable AWS_SECRET_ACCESS_KEY "$AWS_SECRET_ACCESS_KEY"
+    _saveaccountconf_mutable AWS_DNS_SLOWRATE "$AWS_DNS_SLOWRATE"
   fi
 
   _debug "First detect the root zone"
@@ -78,9 +79,9 @@ dns_aws_add() {
 
   if aws_rest POST "2013-04-01$_domain_id/rrset/" "" "$_aws_tmpl_xml" && _contains "$response" "ChangeResourceRecordSetsResponse"; then
     _info "TXT record updated successfully."
-    if [ -n "$slowrateslepp" ]; then
-      _info "Slow rate activated: sleeping for $slowrateslepp seconds"
-      _sleep "$slowrateslepp"
+    if [ -n "$AWS_DNS_SLOWRATE" ]; then
+      _info "Slow rate activated: sleeping for $AWS_DNS_SLOWRATE seconds"
+      _sleep "$AWS_DNS_SLOWRATE"
     else
       _sleep 1
     fi
@@ -95,10 +96,10 @@ dns_aws_add() {
 dns_aws_rm() {
   fulldomain=$1
   txtvalue=$2
-  slowrateslepp=$AWS_DNS_SLOWRATE
 
   AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
   AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
+  AWS_DNS_SLOWRATE="${AWS_DNS_SLOWRATE:-$(_readaccountconf_mutable AWS_DNS_SLOWRATE)}"
 
   if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
     _use_container_role || _use_instance_role
@@ -133,9 +134,9 @@ dns_aws_rm() {
 
   if aws_rest POST "2013-04-01$_domain_id/rrset/" "" "$_aws_tmpl_xml" && _contains "$response" "ChangeResourceRecordSetsResponse"; then
     _info "TXT record deleted successfully."
-    if [ -n "$slowrateslepp" ]; then
-      _info "Slow rate activated: sleeping for $slowrateslepp seconds"
-      _sleep "$slowrateslepp"
+    if [ -n "$AWS_DNS_SLOWRATE" ]; then
+      _info "Slow rate activated: sleeping for $AWS_DNS_SLOWRATE seconds"
+      _sleep "$AWS_DNS_SLOWRATE"
     else
       _sleep 1
     fi