diff --git a/src/core/net/dhcp6_server.cpp b/src/core/net/dhcp6_server.cpp
index 751d186e6..5cb110755 100644
--- a/src/core/net/dhcp6_server.cpp
+++ b/src/core/net/dhcp6_server.cpp
@@ -94,6 +94,7 @@ Error Server::UpdateService(void)
 
         if (!found)
         {
+            Get<ThreadNetif>().RemoveUnicastAddress(prefixAgent.GetAloc());
             prefixAgent.Clear();
             mPrefixAgentsCount--;
         }