diff --git a/drivers/modem/ublox-sara-r4.c b/drivers/modem/ublox-sara-r4.c
index 97f31eb1403..c62cef4d933 100644
--- a/drivers/modem/ublox-sara-r4.c
+++ b/drivers/modem/ublox-sara-r4.c
@@ -1947,7 +1947,22 @@ static const struct socket_op_vtable offload_socket_fd_op_vtable = {
 
 static bool offload_is_supported(int family, int type, int proto)
 {
-	/* TODO offloading always enabled for now. */
+	if (family != AF_INET &&
+	    family != AF_INET6) {
+		return false;
+	}
+
+	if (type != SOCK_DGRAM &&
+	    type != SOCK_STREAM) {
+		return false;
+	}
+
+	if (proto != IPPROTO_TCP &&
+	    proto != IPPROTO_UDP &&
+	    proto != IPPROTO_TLS_1_2) {
+		return false;
+	}
+
 	return true;
 }