diff --git a/magick/cache-private.h b/magick/cache-private.h
index bc30972..be587ec 100644
--- a/magick/cache-private.h
+++ b/magick/cache-private.h
@@ -140,6 +140,9 @@
   VirtualPixelMethod
     virtual_pixel_method;
 
+  MagickPixelPacket
+    virtual_pixel_color;
+
   unsigned long
     number_threads;