diff --git a/src/mibew/libs/common/locale.php b/src/mibew/libs/common/locale.php
index ee06d07d..04e6f3b3 100644
--- a/src/mibew/libs/common/locale.php
+++ b/src/mibew/libs/common/locale.php
@@ -25,17 +25,6 @@ define('LOCALE_COOKIE_NAME', 'mibew_locale');
 
 // Test and set default locales
 
-/**
- * Verified value of the $default_locale configuration parameter (see
- * "configs/default_config.yml" for details)
- */
-define(
-    'DEFAULT_LOCALE',
-    (locale_pattern_check($configs['default_locale']) && locale_exists($configs['default_locale'])
-        ? $configs['default_locale']
-        : 'en')
-);
-
 /**
  * Verified value of the $home_locale configuration parameter (see
  * "configs/default_config.yml" for details)
@@ -141,11 +130,33 @@ function get_user_locale()
         }
     }
 
-    if (locale_pattern_check(DEFAULT_LOCALE) && locale_exists(DEFAULT_LOCALE)) {
-        return DEFAULT_LOCALE;
+    return get_default_locale();
+}
+
+/**
+ * Returns a value of the default locale.
+ *
+ * Generally it should be used if a user does not provide known lang.
+ *
+ * In fact the function returns verified value of "default_locale" variable from
+ * the system configurations file.
+ *
+ * @return string Locale code.
+ */
+function get_default_locale()
+{
+    static $default_locale = null;
+
+    if (is_null($default_locale)) {
+        $configs = load_system_configs();
+        $is_correct = !empty($configs['default_locale'])
+            && locale_pattern_check($configs['default_locale'])
+            && locale_exists($configs['default_locale']);
+
+        $default_locale = $is_correct ? $configs['default_locale'] : 'en';
     }
 
-    return 'en';
+    return $default_locale;
 }
 
 /**
diff --git a/src/mibew/libs/notify.php b/src/mibew/libs/notify.php
index 0868b9d1..6810da46 100644
--- a/src/mibew/libs/notify.php
+++ b/src/mibew/libs/notify.php
@@ -86,12 +86,12 @@ function mail_template_load($name, $locale, $strict = false)
             }
 
             // There is no template in the database.
-            if ($locale == DEFAULT_LOCALE) {
+            if ($locale == get_default_locale()) {
                 // The template is still not found.
                 $template = false;
             } else {
                 // Try to load the template for the default locale.
-                $template = mail_template_load($name, DEFAULT_LOCALE);
+                $template = mail_template_load($name, get_default_locale());
             }
         }