diff --git a/ifupdown2/addons/addressvirtual.py b/ifupdown2/addons/addressvirtual.py
index 9c0cb7d..c5a7c2f 100644
--- a/ifupdown2/addons/addressvirtual.py
+++ b/ifupdown2/addons/addressvirtual.py
@@ -243,6 +243,13 @@ class addressvirtual(moduleBase):
                 except:
                     self.ipcmd.link_add_macvlan(ifaceobj.name, macvlan_ifacename)
                 link_created = True
+            else:
+                if should_configure_ipv6_addrgen:
+                    # When setting addrgenmode it is necessary to flap the macvlan
+                    # device. After flapping the device we also need to re-add all
+                    # the user configuration. The best way to add the user config
+                    # is to flush our internal address cache
+                    self.ipcmd.reset_addr_cache(macvlan_ifacename)
 
             # first thing we need to handle vrf enslavement
             if (ifaceobj.link_privflags & ifaceLinkPrivFlags.VRF_SLAVE):
diff --git a/ifupdown2/ifupdownaddons/LinkUtils.py b/ifupdown2/ifupdownaddons/LinkUtils.py
index 4c63d0d..6fb42e2 100644
--- a/ifupdown2/ifupdownaddons/LinkUtils.py
+++ b/ifupdown2/ifupdownaddons/LinkUtils.py
@@ -2638,6 +2638,13 @@ class LinkUtils(utilsBase):
         except:
             return []
 
+    def reset_addr_cache(self, ifname):
+        try:
+            linkCache.links[ifname]['addrs'] = {}
+            self.logger.debug('%s: reset address cache' % ifname)
+        except:
+            pass
+
     def ipv6_addrgen(self, ifname, addrgen):
         cmd = 'link set dev %s addrgenmode %s' % (ifname, 'eui64' if addrgen else 'none')