diff --git a/dlls/ntdll/unix/socket.c b/dlls/ntdll/unix/socket.c
index efbfc375969..09318a279ed 100644
--- a/dlls/ntdll/unix/socket.c
+++ b/dlls/ntdll/unix/socket.c
@@ -1888,6 +1888,11 @@ NTSTATUS sock_ioctl( HANDLE handle, HANDLE event, PIO_APC_ROUTINE apc, void *apc
         case IOCTL_AFD_WINE_SET_IPV6_UNICAST_HOPS:
             return do_setsockopt( handle, io, IPPROTO_IPV6, IPV6_UNICAST_HOPS, in_buffer, in_size );
 
+#ifdef IPV6_UNICAST_IF
+        case IOCTL_AFD_WINE_GET_IPV6_UNICAST_IF:
+            return do_getsockopt( handle, io, IPPROTO_IPV6, IPV6_UNICAST_IF, out_buffer, out_size );
+#endif
+
         default:
         {
             if ((code >> 16) == FILE_DEVICE_NETWORK)
diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index 3ca2ce545b4..2ca4f2c1831 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -2424,10 +2424,10 @@ INT WINAPI WS_getsockopt(SOCKET s, INT level,
         case WS_IPV6_UNICAST_HOPS:
             return server_getsockopt( s, IOCTL_AFD_WINE_GET_IPV6_UNICAST_HOPS, optval, optlen );
 
-        case WS_IPV6_V6ONLY:
-#ifdef IPV6_UNICAST_IF
         case WS_IPV6_UNICAST_IF:
-#endif
+            return server_getsockopt( s, IOCTL_AFD_WINE_GET_IPV6_UNICAST_IF, optval, optlen );
+
+        case WS_IPV6_V6ONLY:
             if ( (fd = get_sock_fd( s, 0, NULL )) == -1)
                 return SOCKET_ERROR;
             convert_sockopt(&level, &optname);
diff --git a/include/wine/afd.h b/include/wine/afd.h
index 64d555889f5..b43d53522a4 100644
--- a/include/wine/afd.h
+++ b/include/wine/afd.h
@@ -219,6 +219,7 @@ struct afd_get_events_params
 #define IOCTL_AFD_WINE_SET_IPV6_MULTICAST_LOOP          WINE_AFD_IOC(274)
 #define IOCTL_AFD_WINE_GET_IPV6_UNICAST_HOPS            WINE_AFD_IOC(275)
 #define IOCTL_AFD_WINE_SET_IPV6_UNICAST_HOPS            WINE_AFD_IOC(276)
+#define IOCTL_AFD_WINE_GET_IPV6_UNICAST_IF              WINE_AFD_IOC(277)
 
 struct afd_create_params
 {