diff --git a/reactos/drivers/video/miniport/vga/vgamp.c b/reactos/drivers/video/miniport/vga/vgamp.c
index 8dd9cd116c0..edd5d81b443 100644
--- a/reactos/drivers/video/miniport/vga/vgamp.c
+++ b/reactos/drivers/video/miniport/vga/vgamp.c
@@ -82,6 +82,7 @@ DriverEntry(IN PVOID Context1,
 
   VideoPortZeroMemory(&InitData, sizeof InitData);
   
+  InitData.HwInitDataSize = sizeof(InitData);
   /* FIXME: Fill in InitData members  */
   InitData.StartingDeviceNumber = 0;