diff --git a/doc/man-sections/vpn-network-options.rst b/doc/man-sections/vpn-network-options.rst
index 825dd1ca..26682789 100644
--- a/doc/man-sections/vpn-network-options.rst
+++ b/doc/man-sections/vpn-network-options.rst
@@ -114,6 +114,10 @@ routing.
   :code:`DOMAIN` ``name``
         Set Connection-specific DNS Suffix to :code:`name`.
 
+  :code:`ADAPTER_DOMAIN_SUFFIX` ``name``
+        Alias to :code:`DOMAIN`. This is a compatibility option, it
+        should not be used in new deployments.
+
   :code:`DOMAIN-SEARCH` ``name``
         Add :code:`name` to the domain search list.
         Repeat this option to add more entries. Up to
diff --git a/src/openvpn/options.c b/src/openvpn/options.c
index 4b22d3d9..3df803db 100644
--- a/src/openvpn/options.c
+++ b/src/openvpn/options.c
@@ -7440,7 +7440,8 @@ add_option(struct options *options,
         VERIFY_PERMISSION(OPT_P_IPWIN32);
         bool ipv6dns = false;
 
-        if (streq(p[1], "DOMAIN") && p[2])
+        if ((streq(p[1], "DOMAIN") || streq(p[1], "ADAPTER_DOMAIN_SUFFIX"))
+            && p[2])
         {
             o->domain = p[2];
         }