diff --git a/MagickCore/image.h b/MagickCore/image.h
index 2bb26f4..92efa1e 100644
--- a/MagickCore/image.h
+++ b/MagickCore/image.h
@@ -275,7 +275,7 @@
     mask;
 
   PixelTrait
-    alpha_traits;
+    alpha_trait;
 
   size_t
     number_channels,