diff --git a/PInvoke/ComCtl32/CommCtrl.TaskDialog.cs b/PInvoke/ComCtl32/CommCtrl.TaskDialog.cs
index 4dd27d0b..3978876f 100644
--- a/PInvoke/ComCtl32/CommCtrl.TaskDialog.cs
+++ b/PInvoke/ComCtl32/CommCtrl.TaskDialog.cs
@@ -945,7 +945,7 @@ namespace Vanara.PInvoke
 		/// uses this structure.
 		/// </summary>
 		[PInvokeData("Commctrl.h", MSDNShortId = "bb787475")]
-		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 1)]
 		public struct TASKDIALOG_BUTTON
 		{
 			/// <summary>Indicates the value to be returned when this button is selected.</summary>
@@ -1243,4 +1243,4 @@ namespace Vanara.PInvoke
 			}
 		}
 	}
-}
\ No newline at end of file
+}