diff --git a/core/insertion_marker_manager.js b/core/insertion_marker_manager.js
index 661aa5fa8..490e88ef3 100644
--- a/core/insertion_marker_manager.js
+++ b/core/insertion_marker_manager.js
@@ -12,10 +12,16 @@
 
 goog.provide('Blockly.InsertionMarkerManager');
 
+goog.require('Blockly.Block');
 goog.require('Blockly.blockAnimations');
 goog.require('Blockly.constants');
 goog.require('Blockly.Events');
 
+goog.requireType('Blockly.BlockSvg');
+goog.requireType('Blockly.RenderedConnection');
+goog.requireType('Blockly.utils.Coordinate');
+goog.requireType('Blockly.WorkspaceSvg');
+
 
 /**
  * Class that controls updates to connections during drags.  It is primarily