diff --git a/MagickCore/display.c b/MagickCore/display.c
index 85c4583..d0308b2 100644
--- a/MagickCore/display.c
+++ b/MagickCore/display.c
@@ -87,6 +87,8 @@
 #include "MagickCore/utility.h"
 #include "MagickCore/version.h"
 #include "MagickCore/widget.h"
+#include "MagickCore/widget-private.h"
+#include "MagickCore/xwindow.h"
 #include "MagickCore/xwindow-private.h"
 
 #if defined(MAGICKCORE_X11_DELEGATE)