diff --git a/dnsapi/dns_azure.sh b/dnsapi/dns_azure.sh
index bf7cf2bf..28b6572a 100644
--- a/dnsapi/dns_azure.sh
+++ b/dnsapi/dns_azure.sh
@@ -172,7 +172,7 @@ dns_azure_rm() {
   _azure_rest GET "$acmeRecordURI" "" "$accesstoken"
   timestamp="$(_time)"
   if [ "$_code" = "200" ]; then
-    vlist="$(echo "$response" | _egrep_o "\"value\"\\s*:\\s*\\[\\s*\"[^\"]*\"\\s*]" | cut -d : -f 2 | tr -d "[]\"" | grep -v "$txtvalue")"
+    vlist="$(echo "$response" | _egrep_o "\"value\"\\s*:\\s*\\[\\s*\"[^\"]*\"\\s*]" | cut -d : -f 2 | tr -d "[]\"" | grep -v -- "$txtvalue")"
     values=""
     comma=""
     for v in $vlist; do