diff --git a/core/block.js b/core/block.js
index 80e70c2d1..a672248eb 100644
--- a/core/block.js
+++ b/core/block.js
@@ -253,13 +253,6 @@ Blockly.Block.prototype.secondaryColour_ = null;
  */
 Blockly.Block.prototype.tertiaryColour_ = null;
 
-/**
- * Style of the block.
- * @type {?Object} Map from style attribute name (string) to style value (string)
- * @private
- */
-Blockly.Block.prototype.style_ = null;
-
 /**
  * Name of the block style.
  * @type {?string}