diff --git a/MagickCore/statistic.h b/MagickCore/statistic.h
index a410db3..e3a93a4 100644
--- a/MagickCore/statistic.h
+++ b/MagickCore/statistic.h
@@ -42,7 +42,8 @@
     variance,
     standard_deviation,
     kurtosis,
-    skewness;
+    skewness,
+    entropy;
 } ChannelStatistics;
 
 typedef struct _ChannelMoments