diff --git a/dlls/ntdll/unix/socket.c b/dlls/ntdll/unix/socket.c
index 14bdaed19f7..e9239bd7bb9 100644
--- a/dlls/ntdll/unix/socket.c
+++ b/dlls/ntdll/unix/socket.c
@@ -1879,6 +1879,9 @@ NTSTATUS sock_ioctl( HANDLE handle, HANDLE event, PIO_APC_ROUTINE apc, void *apc
         case IOCTL_AFD_WINE_GET_IPV6_MULTICAST_LOOP:
             return do_getsockopt( handle, io, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, out_buffer, out_size );
 
+        case IOCTL_AFD_WINE_SET_IPV6_MULTICAST_LOOP:
+            return do_setsockopt( handle, io, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, in_buffer, in_size );
+
         default:
         {
             if ((code >> 16) == FILE_DEVICE_NETWORK)
diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index 432f3a26f30..1f8020b5c3e 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -3638,6 +3638,8 @@ int WINAPI WS_setsockopt(SOCKET s, int level, int optname,
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_IF, optval, optlen );
 
         case WS_IPV6_MULTICAST_LOOP:
+            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_LOOP, optval, optlen );
+
         case WS_IPV6_UNICAST_HOPS:
 #ifdef IPV6_UNICAST_IF
         case WS_IPV6_UNICAST_IF:
diff --git a/include/wine/afd.h b/include/wine/afd.h
index 3d4dcf539cd..6c84b72c028 100644
--- a/include/wine/afd.h
+++ b/include/wine/afd.h
@@ -216,6 +216,7 @@ struct afd_get_events_params
 #define IOCTL_AFD_WINE_GET_IPV6_MULTICAST_IF            WINE_AFD_IOC(271)
 #define IOCTL_AFD_WINE_SET_IPV6_MULTICAST_IF            WINE_AFD_IOC(272)
 #define IOCTL_AFD_WINE_GET_IPV6_MULTICAST_LOOP          WINE_AFD_IOC(273)
+#define IOCTL_AFD_WINE_SET_IPV6_MULTICAST_LOOP          WINE_AFD_IOC(274)
 
 struct afd_create_params
 {