diff --git a/magick/statistic.h b/magick/statistic.h
index b030af2..500a51a 100644
--- a/magick/statistic.h
+++ b/magick/statistic.h
@@ -32,6 +32,8 @@
     maxima,
     sum,
     sum_squared,
+    sum_cubed,
+    sum_fourth_power,
     mean,
     variance,
     standard_deviation,