diff --git a/MagickWand/mogrify.c b/MagickWand/mogrify.c
index f01b3ed..4561169 100644
--- a/MagickWand/mogrify.c
+++ b/MagickWand/mogrify.c
@@ -55,6 +55,14 @@
 #include "MagickCore/string-private.h"
 
 /*
+ Constant declaration.
+*/
+const char
+  BackgroundColor[] = "#ffffff",  /* white */
+  BorderColor[] = "#dfdfdf",  /* gray */
+  MatteColor[] = "#bdbdbd";  /* gray */
+
+/*
   Define declarations.
 */
 #define UndefinedCompressionQuality  0UL