diff --git a/wand/magick-image.h b/wand/magick-image.h
index 25eb083..0678844 100644
--- a/wand/magick-image.h
+++ b/wand/magick-image.h
@@ -339,8 +339,9 @@
     const ssize_t),
   MagickSpreadImage(MagickWand *,const double),
   MagickStatisticImage(MagickWand *,const ChannelType,const StatisticType,
-    const double),
-  MagickStatisticImageChannel(MagickWand *,const StatisticType,const double),
+    const size_t,const size_t),
+  MagickStatisticImageChannel(MagickWand *,const StatisticType,const size_t,
+    const size_t),
   MagickStripImage(MagickWand *),
   MagickSwirlImage(MagickWand *,const double),
   MagickTintImage(MagickWand *,const PixelWand *,const PixelWand *),