diff --git a/polaris-plugins/polaris-plugins-registry/registry-memory/src/main/java/com/tencent/polaris/plugins/registry/memory/InMemoryRegistry.java b/polaris-plugins/polaris-plugins-registry/registry-memory/src/main/java/com/tencent/polaris/plugins/registry/memory/InMemoryRegistry.java
index f950b88e..9f965736 100644
--- a/polaris-plugins/polaris-plugins-registry/registry-memory/src/main/java/com/tencent/polaris/plugins/registry/memory/InMemoryRegistry.java
+++ b/polaris-plugins/polaris-plugins-registry/registry-memory/src/main/java/com/tencent/polaris/plugins/registry/memory/InMemoryRegistry.java
@@ -371,6 +371,7 @@ public void updateInstances(ServiceUpdateRequest request) {
                 switch (entry.getKey()) {
                     case InstanceProperty.PROPERTY_DETECT_RESULT:
                         instanceLocalValue.setDetectResult((DetectResult) entry.getValue());
+                        changed = true;
                         break;
                     default:
                         break;