diff --git a/lib/primitives/mtx.js b/lib/primitives/mtx.js
index b7459002..22510bba 100644
--- a/lib/primitives/mtx.js
+++ b/lib/primitives/mtx.js
@@ -1349,7 +1349,7 @@ MTX.prototype.format = function format() {
  */
 
 MTX.prototype.toJSON = function toJSON() {
-  return TX.prototype.toJSON.call(this, null, this.view);
+  return TX.prototype.getJSON.call(this, null, this.view);
 };
 
 /**