diff --git a/src/NPlug/IAudioPluginView.cs b/src/NPlug/IAudioPluginView.cs
index 4f21905..d971488 100644
--- a/src/NPlug/IAudioPluginView.cs
+++ b/src/NPlug/IAudioPluginView.cs
@@ -2,10 +2,6 @@
 // Licensed under the BSD-Clause 2 license.
 // See license.txt file in the project root for full license information.
 
-using NPlug.Interop;
-using System.Runtime.InteropServices;
-using static NPlug.Interop.LibVst;
-
 namespace NPlug;
 
 /// <summary>
@@ -67,7 +63,7 @@ public interface IAudioPluginView
     /// Handling of mouse wheel.
     /// </summary>
     void OnWheel(float distance);
-    
+
     /// <summary>
     /// Handling of keyboard events : Key Down.
     /// </summary>
@@ -97,7 +93,7 @@ public interface IAudioPluginView
     /// requests a resize (IPlugFrame::resizeView ()) onSize has to be called afterward.
     /// </summary>
     void OnSize(ViewRectangle newSize);
-    
+
     /// <summary>
     /// Focus changed message.
     /// </summary>
@@ -117,7 +113,7 @@ public interface IAudioPluginView
     /// On live resize this is called to check if the view can be resized to the given rect, if not
     /// adjust the rect to the allowed size.
     /// </summary>
-    bool CheckSizeConstraint(ViewRectangle rect);
+    bool CheckSizeConstraint(ref ViewRectangle rect);
 
     /// <summary>
     /// This interface communicates the content scale factor from the host to the plug-in view on
diff --git a/src/NPlug/Interop/LibVst.IPlugView.cs b/src/NPlug/Interop/LibVst.IPlugView.cs
index 20a0359..4965b71 100644
--- a/src/NPlug/Interop/LibVst.IPlugView.cs
+++ b/src/NPlug/Interop/LibVst.IPlugView.cs
@@ -86,7 +86,7 @@ private static partial ComResult canResize_ToManaged(IPlugView* self)
 
         private static partial ComResult checkSizeConstraint_ToManaged(IPlugView* self, ViewRect* rect)
         {
-            return Get(self).CheckSizeConstraint(*(ViewRectangle*)rect);
+            return Get(self).CheckSizeConstraint(ref *(ViewRectangle*)rect);
         }
 
         private static bool TryGetPlatform(FIDString type, out AudioPluginViewPlatform platform)