diff --git a/MagickCore/widget.c b/MagickCore/widget.c
index 6d745d1..708d551 100644
--- a/MagickCore/widget.c
+++ b/MagickCore/widget.c
@@ -52,6 +52,7 @@
 #include "MagickCore/string_.h"
 #include "MagickCore/token.h"
 #include "MagickCore/utility.h"
+#include "MagickCore/utility-private.h"
 #include "MagickCore/xwindow-private.h"
 #include "MagickCore/widget.h"
 #include "MagickCore/widget-private.h"