diff --git a/typings/templates/blockly-interfaces.template b/typings/templates/blockly-interfaces.template
index e2880f95e..dd78194d6 100644
--- a/typings/templates/blockly-interfaces.template
+++ b/typings/templates/blockly-interfaces.template
@@ -2,7 +2,7 @@
 declare module Blockly {
 
   interface BlocklyOptions {
-    toolbox?: HTMLElement | string;
+    toolbox?: Blockly.utils.toolbox.ToolboxDefinition;
     readOnly?: boolean;
     trashcan?: boolean;
     maxInstances?: {[type: string]: number;};