diff --git a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Formats/ImageFrame.cs b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Formats/ImageFrame.cs
index 0e28e0581..eb9a1da44 100644
--- a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Formats/ImageFrame.cs
+++ b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Formats/ImageFrame.cs
@@ -34,7 +34,7 @@ public ImageFrame(ImageFormat.Format format, int width, int height, uint alignme
       this.ptr = ptr;
     }
 
-    public ImageFrame(ImageFormat.Format format, int width, int height, int widthStep, NativeArray<byte> pixelData)
+    public ImageFrame(ImageFormat.Format format, int width, int height, int widthStep, NativeArray<byte> pixelData) : base()
     {
       unsafe
       {
diff --git a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Packet/GpuBufferPacket.cs b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Packet/GpuBufferPacket.cs
index c578f99fc..8230166d6 100644
--- a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Packet/GpuBufferPacket.cs
+++ b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Framework/Packet/GpuBufferPacket.cs
@@ -25,7 +25,7 @@ public GpuBufferPacket(GpuBuffer gpuBuffer) : base()
       this.ptr = ptr;
     }
 
-    public GpuBufferPacket(GpuBuffer gpuBuffer, Timestamp timestamp)
+    public GpuBufferPacket(GpuBuffer gpuBuffer, Timestamp timestamp) : base()
     {
       UnsafeNativeMethods.mp__MakeGpuBufferPacket_At__Rgb_Rts(gpuBuffer.mpPtr, timestamp.mpPtr, out var ptr).Assert();
       GC.KeepAlive(timestamp);
diff --git a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlCalculatorHelper.cs b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlCalculatorHelper.cs
index abc27f1c9..55280944a 100644
--- a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlCalculatorHelper.cs
+++ b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlCalculatorHelper.cs
@@ -5,7 +5,6 @@
 // https://opensource.org/licenses/MIT.
 
 using System;
-using System.Runtime.InteropServices;
 
 namespace Mediapipe
 {
diff --git a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlSyncPoint.cs b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlSyncPoint.cs
index 796f0875b..144723bfb 100644
--- a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlSyncPoint.cs
+++ b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlSyncPoint.cs
@@ -12,7 +12,7 @@ public class GlSyncPoint : MpResourceHandle
   {
     private SharedPtrHandle _sharedPtrHandle;
 
-    public GlSyncPoint(IntPtr ptr) : base(ptr)
+    public GlSyncPoint(IntPtr ptr) : base()
     {
       _sharedPtrHandle = new SharedPtr(ptr);
       this.ptr = _sharedPtrHandle.Get();
diff --git a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlTextureBuffer.cs b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlTextureBuffer.cs
index a77a67251..42b3b18d8 100644
--- a/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlTextureBuffer.cs
+++ b/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Gpu/GlTextureBuffer.cs
@@ -30,7 +30,7 @@ public GlTextureBuffer(IntPtr ptr, bool isOwner = true) : base(isOwner)
     ///   Make sure that this function doesn't throw exceptions and won't be GCed.
     /// </param>
     public GlTextureBuffer(uint target, uint name, int width, int height,
-        GpuBufferFormat format, DeletionCallback callback, GlContext glContext)
+        GpuBufferFormat format, DeletionCallback callback, GlContext glContext) : base()
     {
       var sharedContextPtr = glContext == null ? IntPtr.Zero : glContext.sharedPtr;
       UnsafeNativeMethods.mp_SharedGlTextureBuffer__ui_ui_i_i_ui_PF_PSgc(