Moved aliases to coder header file.
diff --git a/coders/json.h b/coders/json.h
index dbd7c0f..92193a5 100644
--- a/coders/json.h
+++ b/coders/json.h
@@ -18,6 +18,8 @@
 
 #define MagickJSONHeaders
 
+#define MagickJSONAliases
+
 #if defined(__cplusplus) || defined(c_plusplus)
 extern "C" {
 #endif