diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 29a5609483..b314f5db8f 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -2192,7 +2192,7 @@ static int link_update_hardware_address(Link *link, sd_netlink_message *message)
         if (r < 0)
                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
 
-        if (link->ndisc) {
+        if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
                 if (r < 0)
                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c
index 8ace451f7f..2b02978ab4 100644
--- a/src/network/networkd-ndisc.c
+++ b/src/network/networkd-ndisc.c
@@ -1054,9 +1054,11 @@ static int ndisc_configure(Link *link) {
         if (r < 0)
                 return r;
 
-        r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
-        if (r < 0)
-                return r;
+        if (link->hw_addr.length == ETH_ALEN) {
+                r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
+                if (r < 0)
+                        return r;
+        }
 
         r = sd_ndisc_set_ifindex(link->ndisc, link->ifindex);
         if (r < 0)
diff --git a/src/network/networkd-radv.c b/src/network/networkd-radv.c
index 26448b518d..32ee7aa7ab 100644
--- a/src/network/networkd-radv.c
+++ b/src/network/networkd-radv.c
@@ -458,9 +458,11 @@ static int radv_configure(Link *link) {
         if (r < 0)
                 return r;
 
-        r = sd_radv_set_mac(link->radv, &link->hw_addr.ether);
-        if (r < 0)
-                return r;
+        if (link->hw_addr.length == ETH_ALEN) {
+                r = sd_radv_set_mac(link->radv, &link->hw_addr.ether);
+                if (r < 0)
+                        return r;
+        }
 
         r = sd_radv_set_ifindex(link->radv, link->ifindex);
         if (r < 0)
@@ -518,6 +520,9 @@ int radv_update_mac(Link *link) {
         if (!link->radv)
                 return 0;
 
+        if (link->hw_addr.length != ETH_ALEN)
+                return 0;
+
         restart = sd_radv_is_running(link->radv);
 
         r = sd_radv_stop(link->radv);