diff --git a/Runtime/Debugger/DebuggerComponent.TimerInformationWindow.cs b/Runtime/Debugger/DebuggerComponent.TimerInformationWindow.cs
index b02d7fb..5fdd115 100644
--- a/Runtime/Debugger/DebuggerComponent.TimerInformationWindow.cs
+++ b/Runtime/Debugger/DebuggerComponent.TimerInformationWindow.cs
@@ -23,7 +23,7 @@ namespace AlicizaX.Debugger.Runtime
                 public VisualElement Fill;
             }
 
-            private ITimerServiceDebug _mTimerDebug;
+            private ITimerService _mTimerDebug;
             private readonly TimerDebugInfo[] m_TimerInfos = new TimerDebugInfo[MAX_DISPLAY_COUNT];
             private readonly RowView[] m_TimerRows = new RowView[MAX_DISPLAY_COUNT];
             private VisualElement m_ActiveUsageFill;
@@ -35,7 +35,7 @@ namespace AlicizaX.Debugger.Runtime
 
             public override void Initialize(params object[] args)
             {
-                _mTimerDebug = AppServices.Require<ITimerService>() as ITimerServiceDebug;
+                _mTimerDebug = AppServices.Require<ITimerService>();
             }
 
             public override void OnEnter()
diff --git a/Runtime/Timer/ITimerService.cs b/Runtime/Timer/ITimerService.cs
index 7c495a2..a5b75df 100644
--- a/Runtime/Timer/ITimerService.cs
+++ b/Runtime/Timer/ITimerService.cs
@@ -1,5 +1,21 @@
 using System;
 
+public static class TimerDebugFlags
+{
+    public const byte Running = 1 << 0;
+    public const byte Loop = 1 << 1;
+    public const byte Unscaled = 1 << 2;
+}
+
+public struct TimerDebugInfo
+{
+    public ulong TimerHandle;
+    public float LeftTime;
+    public float Duration;
+    public float Age;
+    public byte Flags;
+}
+
 namespace AlicizaX.Timer.Runtime
 {
     [UnityEngine.Scripting.Preserve]
@@ -13,5 +29,11 @@ namespace AlicizaX.Timer.Runtime
         float GetLeftTime(ulong timerHandle);
         void Restart(ulong timerHandle);
         void RemoveTimer(ulong timerHandle);
+
+        int GetAllTimers(TimerDebugInfo[] results);
+
+        void GetStatistics(out int activeCount, out int poolCapacity, out int peakActiveCount, out int freeCount);
+
+        int GetStaleOneShotTimers(TimerDebugInfo[] results);
     }
 }
diff --git a/Runtime/Timer/ITimerServiceDebug.cs b/Runtime/Timer/ITimerServiceDebug.cs
deleted file mode 100644
index b1b50e6..0000000
--- a/Runtime/Timer/ITimerServiceDebug.cs
+++ /dev/null
@@ -1,27 +0,0 @@
-namespace AlicizaX.Timer.Runtime
-{
-    internal static class TimerDebugFlags
-    {
-        public const byte Running = 1 << 0;
-        public const byte Loop = 1 << 1;
-        public const byte Unscaled = 1 << 2;
-    }
-
-    internal struct TimerDebugInfo
-    {
-        public ulong TimerHandle;
-        public float LeftTime;
-        public float Duration;
-        public float Age;
-        public byte Flags;
-    }
-
-    internal interface ITimerServiceDebug
-    {
-        int GetAllTimers(TimerDebugInfo[] results);
-
-        void GetStatistics(out int activeCount, out int poolCapacity, out int peakActiveCount, out int freeCount);
-
-        int GetStaleOneShotTimers(TimerDebugInfo[] results);
-    }
-}
diff --git a/Runtime/Timer/ITimerServiceDebug.cs.meta b/Runtime/Timer/ITimerServiceDebug.cs.meta
deleted file mode 100644
index 396fbe4..0000000
--- a/Runtime/Timer/ITimerServiceDebug.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: 5b7cf36ada40b944f8c506e3cd8ddd12
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/Runtime/Timer/TimerService.cs b/Runtime/Timer/TimerService.cs
index e21cf9f..66ab4c1 100644
--- a/Runtime/Timer/TimerService.cs
+++ b/Runtime/Timer/TimerService.cs
@@ -22,7 +22,7 @@ namespace AlicizaX.Timer.Runtime
     [UnityEngine.Scripting.Preserve]
     [Il2CppSetOption(Option.NullChecks, false)]
     [Il2CppSetOption(Option.ArrayBoundsChecks, false)]
-    internal sealed class TimerService : ServiceBase, ITimerService, IServiceTickable, ITimerServiceDebug
+    internal sealed class TimerService : ServiceBase, ITimerService, IServiceTickable
     {
         private const int PAGE_SHIFT = 8;
         private const int PAGE_SIZE = 1 << PAGE_SHIFT;
@@ -443,7 +443,7 @@ namespace AlicizaX.Timer.Runtime
 
         public int Order => 0;
 
-        void ITimerServiceDebug.GetStatistics(out int activeCount, out int poolCapacity, out int peakActiveCount, out int freeCount)
+        void ITimerService.GetStatistics(out int activeCount, out int poolCapacity, out int peakActiveCount, out int freeCount)
         {
             activeCount = _activeCount;
             poolCapacity = _slotCapacity;
@@ -451,7 +451,7 @@ namespace AlicizaX.Timer.Runtime
             freeCount = _freeCount;
         }
 
-        int ITimerServiceDebug.GetAllTimers(TimerDebugInfo[] results)
+        int ITimerService.GetAllTimers(TimerDebugInfo[] results)
         {
             if (results == null || results.Length == 0)
             {
@@ -470,7 +470,7 @@ namespace AlicizaX.Timer.Runtime
             return count;
         }
 
-        int ITimerServiceDebug.GetStaleOneShotTimers(TimerDebugInfo[] results)
+        int ITimerService.GetStaleOneShotTimers(TimerDebugInfo[] results)
         {
             if (results == null || results.Length == 0)
             {