diff --git a/core/blockly.ts b/core/blockly.ts
index f7b3e9b5542..b1d2cc20d4d 100644
--- a/core/blockly.ts
+++ b/core/blockly.ts
@@ -118,7 +118,7 @@ import {MarkerManager} from './marker_manager.js';
 import {Menu} from './menu.js';
 import {MenuItem} from './menuitem.js';
 import {MetricsManager} from './metrics_manager.js';
-import {Msg} from './msg.js';
+import {Msg, setLocale} from './msg.js';
 import {Mutator} from './mutator.js';
 import {Names} from './names.js';
 import {Options} from './options.js';
@@ -560,17 +560,6 @@ export const VARIABLE_DYNAMIC_CATEGORY_NAME: string =
  */
 export const PROCEDURE_CATEGORY_NAME: string = Procedures.CATEGORY_NAME;
 
-/**
- * Sets the locale (i.e. the localized messages/block-text/etc) to the given
- * locale.
- *
- * @param locale An object defining the messages for the given language.
- */
-export const setLocale = function(locale: {[key: string]: string}) {
-  Object.keys(locale).forEach(function(k) {
-    Blockly.Msg[k] = locale[k];
-  });
-};
 
 // Context for why we need to monkey-patch in these functions (internal):
 //   https://docs.google.com/document/d/1MbO0LEA-pAyx1ErGLJnyUqTLrcYTo-5zga9qplnxeXo/edit?usp=sharing&resourcekey=0-5h_32-i-dHwHjf_9KYEVKg
@@ -732,7 +721,7 @@ export {Menu};
 export {MenuItem};
 export {MetricsManager};
 export {Mutator};
-export {Msg};
+export {Msg, setLocale};
 export {Names};
 export {Options};
 export {RenderedConnection};
diff --git a/core/msg.ts b/core/msg.ts
index 4d4c440d56b..33bc93e6416 100644
--- a/core/msg.ts
+++ b/core/msg.ts
@@ -15,3 +15,15 @@ goog.declareModuleId('Blockly.Msg');
 
 /** A dictionary of localised messages. */
 export const Msg: {[key: string]: string} = Object.create(null);
+
+/**
+ * Sets the locale (i.e. the localized messages/block-text/etc) to the given
+ * locale.
+ *
+ * @param locale An object defining the messages for a given language.
+ */
+export const setLocale = function(locale: {[key: string]: string}) {
+  Object.keys(locale).forEach(function(k) {
+    Msg[k] = locale[k];
+  });
+};
diff --git a/scripts/package/browser/core.js b/scripts/package/browser/core.js
index a0b0d92593a..7471feda61d 100644
--- a/scripts/package/browser/core.js
+++ b/scripts/package/browser/core.js
@@ -12,9 +12,3 @@
 /* eslint-disable */
 'use strict';
 
-// Add a helper method to set the Blockly locale.
-Blockly.setLocale = function (locale) {
-  Object.keys(locale).forEach(function (k) {
-    Blockly.Msg[k] = locale[k];
-  });
-};
diff --git a/scripts/package/node/core.js b/scripts/package/node/core.js
index 2135b966dfb..11e77b5b6a9 100644
--- a/scripts/package/node/core.js
+++ b/scripts/package/node/core.js
@@ -12,12 +12,6 @@
 /* eslint-disable */
 'use strict';
 
-// Add a helper method to set the Blockly locale.
-Blockly.setLocale = function (locale) {
-  Object.keys(locale).forEach(function (k) {
-    Blockly.Msg[k] = locale[k];
-  });
-};
 
 // Override textToDomDocument and provide Node.js alternatives to DOMParser and
 // XMLSerializer.