diff --git a/reactos/include/reactos/winsock/nsp_dns.h b/reactos/include/reactos/winsock/nsp_dns.h
index c8c0e0cb847..75b5e6167cb 100644
--- a/reactos/include/reactos/winsock/nsp_dns.h
+++ b/reactos/include/reactos/winsock/nsp_dns.h
@@ -11,14 +11,15 @@
 
 /* Includes */
 #include <svcguid.h>
+#include <guiddef.h>
 
 /* Globals */
-GUID HostnameGuid = SVCID_HOSTNAME;
-GUID AddressGuid = SVCID_INET_HOSTADDRBYINETSTRING;
-GUID HostAddrByNameGuid = SVCID_INET_HOSTADDRBYNAME;
-GUID IANAGuid = SVCID_INET_SERVICEBYNAME;
-GUID InetHostName = SVCID_INET_HOSTADDRBYNAME;
-GUID Ipv6Guid = SVCID_DNS_TYPE_AAAA;
+const GUID DECLSPEC_SELECTANY HostnameGuid = SVCID_HOSTNAME;
+const GUID DECLSPEC_SELECTANY AddressGuid = SVCID_INET_HOSTADDRBYINETSTRING;
+const GUID DECLSPEC_SELECTANY HostAddrByNameGuid = SVCID_INET_HOSTADDRBYNAME;
+const GUID DECLSPEC_SELECTANY IANAGuid = SVCID_INET_SERVICEBYNAME;
+const GUID DECLSPEC_SELECTANY InetHostName = SVCID_INET_HOSTADDRBYNAME;
+const GUID DECLSPEC_SELECTANY Ipv6Guid = SVCID_DNS_TYPE_AAAA;
 
 /* Macros and Defines */
 #define RNR_BUFFER_SIZE 512