diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 32a83259e3..8e92d2d3f4 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -5,6 +5,7 @@ Yii Framework 2 Change Log
 -----------------------
 
 - Bug #9851: Fixed partial commit / rollback in nested transactions (sammousa)
+- Bug #10850: Fixed unable to use 'definitions' and 'aliases' at `yii\widgets\MaskedInput` (rahimov, klimov-paul)
 - Bug #10946: Fixed parameters binding to the SQL query in `yii\db\mysqlSchema::findConstraints()` (silverfire)
 - Enh #5469: Add mimetype validation by mask in FileValidator (kirsenn, samdark, silverfire)
 - Enh #10487: `yii\helpers\BaseArrayHelper::index()` got a third parameter `$groupBy` to group the input array by the key in one or more dimensions (quantum13, silverfire, samdark)
diff --git a/framework/widgets/MaskedInput.php b/framework/widgets/MaskedInput.php
index 5563c44821..c162f20e14 100644
--- a/framework/widgets/MaskedInput.php
+++ b/framework/widgets/MaskedInput.php
@@ -178,10 +178,10 @@ class MaskedInput extends InputWidget
         }
         $this->hashPluginOptions($view);
         if (is_array($this->definitions) && !empty($this->definitions)) {
-            $js .= '$.extend($.' . self::PLUGIN_NAME . '.defaults.definitions, ' . Json::htmlEncode($this->definitions) . ');';
+            $js .= ucfirst(self::PLUGIN_NAME) . '.extendDefinitions(' . Json::htmlEncode($this->definitions) . ');';
         }
         if (is_array($this->aliases) && !empty($this->aliases)) {
-            $js .= '$.extend($.' . self::PLUGIN_NAME . '.defaults.aliases, ' . Json::htmlEncode($this->aliases) . ');';
+            $js .= ucfirst(self::PLUGIN_NAME) . '.extendAliases(' . Json::htmlEncode($this->aliases) . ');';
         }
         $id = $this->options['id'];
         $js .= '$("#' . $id . '").' . self::PLUGIN_NAME . '(' . $this->_hashVar . ');';