diff --git a/src/openvpn/options.c b/src/openvpn/options.c
index b88fea9..abd2e0c 100644
--- a/src/openvpn/options.c
+++ b/src/openvpn/options.c
@@ -1364,6 +1364,8 @@
         {
             msg(M_WARN, "WARNING: couldn't copy all --dns search-domains to --dhcp-option");
         }
+
+        tt->dhcp_options |= DHCP_OPTIONS_DHCP_REQUIRED;
     }
 
     if (dns->servers)
@@ -1401,6 +1403,7 @@
         {
             msg(M_WARN, "WARNING: couldn't copy all --dns server addresses to --dhcp-option");
         }
+        tt->dhcp_options |= DHCP_OPTIONS_DHCP_OPTIONAL;
     }
 }
 #else /* if defined(_WIN32) || defined(TARGET_ANDROID) */