diff --git a/src/Form/UnixTimeConversionSettings.php b/src/Form/UnixTimeConversionSettings.php
index e59d3d9..63583d0 100644
--- a/src/Form/UnixTimeConversionSettings.php
+++ b/src/Form/UnixTimeConversionSettings.php
@@ -78,8 +78,8 @@ class UnixTimeConversionSettings extends ConfigFormBase {
     $form['unix_time_conversion_time_to_date']['unix_time_conversion_time_to_date_output_format'] = array(
       '#title' => t('Date Output Format'),
       '#type' => 'textfield',
-      '#description' => t('A user-defined date format. See the !phpmanual for available options.', array(
-        '!phpmanual' => $link,
+      '#description' => t('A user-defined date format. See the @phpmanual for available options.', array(
+        '@phpmanual' => $link,
           )
       ),
       '#required' => TRUE,