diff --git a/runtime/dart_isolate.cc b/runtime/dart_isolate.cc
index 3dc8403506f7f..4af4758d6154a 100644
--- a/runtime/dart_isolate.cc
+++ b/runtime/dart_isolate.cc
@@ -633,10 +633,16 @@ bool DartIsolate::UpdateThreadPoolNames() const {
   }
 
   if (auto task_runner = task_runners.GetPlatformTaskRunner()) {
+    bool is_merged_platform_ui_thread =
+        task_runner == task_runners.GetUITaskRunner();
+    std::string label;
+    if (is_merged_platform_ui_thread) {
+      label = task_runners.GetLabel() + std::string{".ui"};
+    } else {
+      label = task_runners.GetLabel() + std::string{".platform"};
+    }
     task_runner->PostTask(
-        [label = task_runners.GetLabel() + std::string{".platform"}]() {
-          Dart_SetThreadName(label.c_str());
-        });
+        [label = std::move(label)]() { Dart_SetThreadName(label.c_str()); });
   }
 
   return true;
diff --git a/shell/platform/android/android_shell_holder.cc b/shell/platform/android/android_shell_holder.cc
index 49a969627d476..e86effe09bd92 100644
--- a/shell/platform/android/android_shell_holder.cc
+++ b/shell/platform/android/android_shell_holder.cc
@@ -89,17 +89,17 @@ AndroidShellHolder::AndroidShellHolder(
   static size_t thread_host_count = 1;
   auto thread_label = std::to_string(thread_host_count++);
 
-  auto mask =
-      ThreadHost::Type::kUi | ThreadHost::Type::kRaster | ThreadHost::Type::kIo;
+  auto mask = ThreadHost::Type::kRaster | ThreadHost::Type::kIo;
+  if (!settings.merged_platform_ui_thread) {
+    mask |= ThreadHost::Type::kUi;
+  }
 
   flutter::ThreadHost::ThreadHostConfig host_config(
       thread_label, mask, AndroidPlatformThreadConfigSetter);
-  if (!settings.merged_platform_ui_thread) {
-    host_config.ui_config = fml::Thread::ThreadConfig(
-        flutter::ThreadHost::ThreadHostConfig::MakeThreadName(
-            flutter::ThreadHost::Type::kUi, thread_label),
-        fml::Thread::ThreadPriority::kDisplay);
-  }
+  host_config.ui_config = fml::Thread::ThreadConfig(
+      flutter::ThreadHost::ThreadHostConfig::MakeThreadName(
+          flutter::ThreadHost::Type::kUi, thread_label),
+      fml::Thread::ThreadPriority::kDisplay);
   host_config.raster_config = fml::Thread::ThreadConfig(
       flutter::ThreadHost::ThreadHostConfig::MakeThreadName(
           flutter::ThreadHost::Type::kRaster, thread_label),
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm b/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm
index b1ca5e66ae6d1..713d4fd0e288f 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm
@@ -792,8 +792,10 @@ + (NSString*)generateThreadLabel:(NSString*)labelPrefix {
   // initialized.
   fml::MessageLoop::EnsureInitializedForCurrentThread();
 
-  uint32_t threadHostType = flutter::ThreadHost::Type::kUi | flutter::ThreadHost::Type::kRaster |
-                            flutter::ThreadHost::Type::kIo;
+  uint32_t threadHostType = flutter::ThreadHost::Type::kRaster | flutter::ThreadHost::Type::kIo;
+  if (!settings.enable_impeller) {
+    threadHostType |= flutter::ThreadHost::Type::kUi;
+  }
 
   if ([FlutterEngine isProfilerEnabled]) {
     threadHostType = threadHostType | flutter::ThreadHost::Type::kProfiler;
@@ -802,13 +804,10 @@ + (NSString*)generateThreadLabel:(NSString*)labelPrefix {
   flutter::ThreadHost::ThreadHostConfig host_config(thread_label.UTF8String, threadHostType,
                                                     IOSPlatformThreadConfigSetter);
 
-  if (!settings.enable_impeller) {
-    host_config.ui_config =
-        fml::Thread::ThreadConfig(flutter::ThreadHost::ThreadHostConfig::MakeThreadName(
-                                      flutter::ThreadHost::Type::kUi, thread_label.UTF8String),
-                                  fml::Thread::ThreadPriority::kDisplay);
-  }
-
+  host_config.ui_config =
+      fml::Thread::ThreadConfig(flutter::ThreadHost::ThreadHostConfig::MakeThreadName(
+                                    flutter::ThreadHost::Type::kUi, thread_label.UTF8String),
+                                fml::Thread::ThreadPriority::kDisplay);
   host_config.raster_config =
       fml::Thread::ThreadConfig(flutter::ThreadHost::ThreadHostConfig::MakeThreadName(
                                     flutter::ThreadHost::Type::kRaster, thread_label.UTF8String),