diff --git a/core/block.js b/core/block.js
index ab1b25089..3d3af48e0 100644
--- a/core/block.js
+++ b/core/block.js
@@ -37,6 +37,7 @@ goog.require('Blockly.Extensions');
 goog.require('Blockly.Input');
 goog.require('Blockly.utils');
 goog.require('Blockly.utils.Coordinate');
+goog.require('Blockly.utils.colour');
 goog.require('Blockly.utils.object');
 goog.require('Blockly.fieldRegistry');
 goog.require('Blockly.utils.string');
diff --git a/core/blockly.js b/core/blockly.js
index 17587d0d9..15adebfc0 100644
--- a/core/blockly.js
+++ b/core/blockly.js
@@ -43,12 +43,13 @@ goog.require('Blockly.WorkspaceSvg');
 goog.require('Blockly.constants');
 goog.require('Blockly.inject');
 goog.require('Blockly.utils');
+goog.require('Blockly.utils.colour');
 goog.require('Blockly.Xml');
 
 
 /**
  * Blockly core version.
- * This constant is overriden by the build script (build.py) to the value of the version
+ * This constant is overridden by the build script (build.py) to the value of the version
  * in package.json. This is done during the gen_core build step.
  * For local builds, you can pass --define='Blockly.VERSION=X.Y.Z' to the compiler
  * to override this constant.