3 files changed, 14 insertions, 3 deletions
diff --git a/src/core/hle/service/acc/acc.cpp b/src/core/hle/service/acc/acc.cpp
index 9a377e86d..c9ab8311e 100644
--- a/src/core/hle/service/acc/acc.cpp
+++ b/src/core/hle/service/acc/acc.cpp
@@ -158,8 +158,9 @@ void Module::Interface::ListAllUsers(Kernel::HLERequestContext& ctx) {
 void Module::Interface::ListOpenUsers(Kernel::HLERequestContext& ctx) {
     LOG_INFO(Service_ACC, "called");
     ctx.WriteBuffer(profile_manager->GetOpenUsers());
-    IPC::ResponseBuilder rb{ctx, 2};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
+    rb.Push<u32>(static_cast<u32>(profile_manager->GetOpenUserCount()));
 }
 
 void Module::Interface::GetLastOpenedUser(Kernel::HLERequestContext& ctx) {
diff --git a/src/core/hle/service/acc/profile_manager.cpp b/src/core/hle/service/acc/profile_manager.cpp
index ef793b311..e8f6884d1 100644
--- a/src/core/hle/service/acc/profile_manager.cpp
+++ b/src/core/hle/service/acc/profile_manager.cpp
@@ -118,6 +118,11 @@ size_t ProfileManager::GetUserCount() const {
     return user_count;
 }
 
+size_t ProfileManager::GetOpenUserCount() const {
+    return std::count_if(profiles.begin(), profiles.end(),
+                         [](const ProfileInfo& p) { return p.is_open; });
+}
+
 bool ProfileManager::UserExists(UUID uuid) const {
     return (GetUserIndex(uuid) != std::numeric_limits<size_t>::max());
 }
@@ -148,8 +153,12 @@ std::array<UUID, MAX_USERS> ProfileManager::GetAllUsers() const {
 
 std::array<UUID, MAX_USERS> ProfileManager::GetOpenUsers() const {
     std::array<UUID, MAX_USERS> output;
-    std::copy_if(profiles.begin(), profiles.end(), output.begin(),
-                 [](const ProfileInfo& p) { return p.is_open; });
+    std::transform(profiles.begin(), profiles.end(), output.begin(), [](const ProfileInfo& p) {
+        if (p.is_open)
+            return p.user_uuid;
+        return UUID{};
+    });
+    std::stable_partition(output.begin(), output.end(), [](const UUID& uuid) { return uuid; });
     return output;
 }
 
diff --git a/src/core/hle/service/acc/profile_manager.h b/src/core/hle/service/acc/profile_manager.h
index 121206954..8ec1273e4 100644
--- a/src/core/hle/service/acc/profile_manager.h
+++ b/src/core/hle/service/acc/profile_manager.h
@@ -92,6 +92,7 @@ public:
     bool GetProfileBaseAndData(ProfileInfo user, ProfileBase& profile,
                                std::array<u8, MAX_DATA>& data);
     size_t GetUserCount() const;
+    size_t GetOpenUserCount() const;
     bool UserExists(UUID uuid) const;
     void OpenUser(UUID uuid);
     void CloseUser(UUID uuid);