diff --git a/lib/gui/pages/main/controllers/flash.js b/lib/gui/pages/main/controllers/flash.js
index 8b71bd1a..5cb4af17 100644
--- a/lib/gui/pages/main/controllers/flash.js
+++ b/lib/gui/pages/main/controllers/flash.js
@@ -19,6 +19,7 @@
 const messages = require('../../../../shared/messages');
 const settings = require('../../../models/settings');
 const flashState = require('../../../models/flash-state');
+const utils = require('../../../../shared/utils');
 
 module.exports = function(
   $state,
@@ -102,14 +103,12 @@ module.exports = function(
   this.getProgressButtonLabel = () => {
     const currentFlashState = flashState.getFlashState();
     const isChecking = currentFlashState.type === 'check';
-    const PERCENTAGE_MINIMUM = 0;
-    const PERCENTAGE_MAXIMUM = 100;
 
     if (!flashState.isFlashing()) {
       return 'Flash!';
-    } else if (currentFlashState.percentage === PERCENTAGE_MINIMUM && !currentFlashState.speed) {
+    } else if (currentFlashState.percentage === utils.PERCENTAGE_MINIMUM && !currentFlashState.speed) {
       return 'Starting...';
-    } else if (currentFlashState.percentage === PERCENTAGE_MAXIMUM) {
+    } else if (currentFlashState.percentage === utils.PERCENTAGE_MAXIMUM) {
       if (isChecking && settings.get('unmountOnSuccess')) {
         return 'Unmounting...';
       }
diff --git a/lib/shared/utils.js b/lib/shared/utils.js
index 8a407099..9ae16746 100644
--- a/lib/shared/utils.js
+++ b/lib/shared/utils.js
@@ -22,18 +22,18 @@ const errors = require('./errors');
 /**
  * @summary Minimum percentage value
  * @constant
- * @private
+ * @public
  * @type {Number}
  */
-const PERCENTAGE_MINIMUM = 0;
+exports.PERCENTAGE_MINIMUM = 0;
 
 /**
  * @summary Maximum percentage value
  * @constant
- * @private
+ * @public
  * @type {Number}
  */
-const PERCENTAGE_MAXIMUM = 100;
+exports.PERCENTAGE_MAXIMUM = 100;
 
 /**
  * @summary Check if a percentage is valid
@@ -51,8 +51,8 @@ const PERCENTAGE_MAXIMUM = 100;
 exports.isValidPercentage = (percentage) => {
   return _.every([
     _.isNumber(percentage),
-    percentage >= PERCENTAGE_MINIMUM,
-    percentage <= PERCENTAGE_MAXIMUM
+    percentage >= exports.PERCENTAGE_MINIMUM,
+    percentage <= exports.PERCENTAGE_MAXIMUM
   ]);
 };
 
@@ -76,5 +76,5 @@ exports.percentageToFloat = (percentage) => {
     });
   }
 
-  return percentage / PERCENTAGE_MAXIMUM;
+  return percentage / exports.PERCENTAGE_MAXIMUM;
 };