diff --git a/libs/fakeservicemanager/ServiceManager.cpp b/libs/fakeservicemanager/ServiceManager.cpp
index 6964324..4ecbe53 100644
--- a/libs/fakeservicemanager/ServiceManager.cpp
+++ b/libs/fakeservicemanager/ServiceManager.cpp
@@ -61,4 +61,16 @@
     return mNameToService.find(name) != mNameToService.end();
 }
 
+Vector<String16> ServiceManager::getDeclaredInstances(const String16& name) {
+    Vector<String16> out;
+    const String16 prefix = name + String16("/");
+    for (const auto& [registeredName, service] : mNameToService) {
+        (void) service;
+        if (registeredName.startsWith(prefix)) {
+            out.add(String16(registeredName.string() + prefix.size()));
+        }
+    }
+    return out;
+}
+
 }  // namespace android
diff --git a/libs/fakeservicemanager/ServiceManager.h b/libs/fakeservicemanager/ServiceManager.h
index a6b6b84..4ef47fb 100644
--- a/libs/fakeservicemanager/ServiceManager.h
+++ b/libs/fakeservicemanager/ServiceManager.h
@@ -46,6 +46,8 @@
 
     bool isDeclared(const String16& name) override;
 
+    Vector<String16> getDeclaredInstances(const String16& iface) override;
+
 private:
     std::map<String16, sp<IBinder>> mNameToService;
 };