diff --git a/MagickCore/cache-private.h b/MagickCore/cache-private.h
index b09145b..118a5a5 100644
--- a/MagickCore/cache-private.h
+++ b/MagickCore/cache-private.h
@@ -129,6 +129,9 @@
     metacontent_extent,
     number_channels;
 
+  PixelChannelMap
+    channel_map[MaxPixelChannels];
+
   CacheType
     type;