diff --git a/renderdocui/Code/Win32PInvoke.cs b/renderdocui/Code/Win32PInvoke.cs
index b51326418..0758f417a 100644
--- a/renderdocui/Code/Win32PInvoke.cs
+++ b/renderdocui/Code/Win32PInvoke.cs
@@ -36,9 +36,22 @@ namespace renderdocui.Code
         [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)]
         public static extern IntPtr LoadLibrary(string lpFileName);
 
+        [StructLayout(LayoutKind.Sequential)]
+        public struct POINT
+        {
+            public int X;
+            public int Y;
+
+            public POINT(int x, int y)
+            {
+                this.X = x;
+                this.Y = y;
+            }
+        }
+
         // for redirecting mousewheel
         [DllImport("user32.dll")]
-        public static extern IntPtr WindowFromPoint(int xPoint, int yPoint);
+        public static extern IntPtr WindowFromPoint(POINT pt);
         [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 8d221aa9a..4da57844f 100644
--- a/renderdocui/Windows/MainWindow.cs
+++ b/renderdocui/Windows/MainWindow.cs
@@ -51,7 +51,9 @@ namespace renderdocui.Windows
                 short x = (short)((pos >> 0) & 0xffff);
                 short y = (short)((pos >> 16) & 0xffff);
 
-                IntPtr wnd = Win32PInvoke.WindowFromPoint((int)x, (int)y);
+                Win32PInvoke.POINT pt = new Win32PInvoke.POINT((int)x, (int)y);
+
+                IntPtr wnd = Win32PInvoke.WindowFromPoint(pt);
 
                 if (wnd != IntPtr.Zero && wnd != m.HWnd && Control.FromHandle(wnd) != null)
                 {