diff --git a/renderdocui/Code/Win32PInvoke.cs b/renderdocui/Code/Win32PInvoke.cs
index 16b53365c..b51326418 100644
--- a/renderdocui/Code/Win32PInvoke.cs
+++ b/renderdocui/Code/Win32PInvoke.cs
@@ -38,7 +38,7 @@ namespace renderdocui.Code
 
         // for redirecting mousewheel
         [DllImport("user32.dll")]
-        public static extern IntPtr WindowFromPoint(System.Drawing.Point pt);
+        public static extern IntPtr WindowFromPoint(int xPoint, int yPoint);
         [DllImport("user32.dll")]
         public static extern IntPtr SendMessage(IntPtr wnd, int msg, IntPtr wp, IntPtr lp);
 
diff --git a/renderdocui/Windows/MainWindow.cs b/renderdocui/Windows/MainWindow.cs
index 61ca1a471..8d221aa9a 100644
--- a/renderdocui/Windows/MainWindow.cs
+++ b/renderdocui/Windows/MainWindow.cs
@@ -51,7 +51,7 @@ namespace renderdocui.Windows
                 short x = (short)((pos >> 0) & 0xffff);
                 short y = (short)((pos >> 16) & 0xffff);
 
-                IntPtr wnd = Win32PInvoke.WindowFromPoint(new Point(x, y));
+                IntPtr wnd = Win32PInvoke.WindowFromPoint((int)x, (int)y);
 
                 if (wnd != IntPtr.Zero && wnd != m.HWnd && Control.FromHandle(wnd) != null)
                 {