<p></p>
<p><b>@JKRhb</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16228#discussion_r686203828">sys/net/gnrc/application_layer/dhcpv6/client.c</a>:</p>
<pre style='color:#555'>> +    gnrc_netif_acquire(netif);
+    i = gnrc_netif_ipv6_addr_idx(netif, addr);
+    if (i >= 0) {
+        netif->ipv6.addrs_flags[i] &= ~GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK;
+        netif->ipv6.addrs_flags[i] |= GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_DEPRECATED;
+    }
+    gnrc_netif_release(netif);
+}
+
+bool dhcpv6_client_remove_addr(unsigned iface, ipv6_addr_t *addr)
+{
+    gnrc_netif_t *netif = gnrc_netif_get_by_pid(iface);
+
+    gnrc_netif_ipv6_addr_remove(netif, addr);
+
+    return false;
</pre>
<p>Okay, great :) I removed it in <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/RIOT-OS/RIOT/commit/5104f6dac08009e322996930c191707bc7b3cfb9/hovercard" href="https://github.com/RIOT-OS/RIOT/commit/5104f6dac08009e322996930c191707bc7b3cfb9"><tt>5104f6d</tt></a></p>

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