diff --git a/MagickCore/resource.c b/MagickCore/resource.c
index 7d640b7..4601ac5 100644
--- a/MagickCore/resource.c
+++ b/MagickCore/resource.c
@@ -62,6 +62,7 @@
 #include "MagickCore/thread-private.h"
 #include "MagickCore/token.h"
 #include "MagickCore/utility.h"
+#include "MagickCore/utility-private.h"
 
 /*
   Typedef declarations.