diff --git a/file_example/src/Form/FileExampleReadWriteForm.php b/file_example/src/Form/FileExampleReadWriteForm.php
index d839982..eaab5bc 100644
--- a/file_example/src/Form/FileExampleReadWriteForm.php
+++ b/file_example/src/Form/FileExampleReadWriteForm.php
@@ -391,12 +391,12 @@ class FileExampleReadWriteForm extends FormBase {
       $file_data = $file_object->toArray();
       if ($url) {
         drupal_set_message(
-         $this->t('Saved managed file: %file to destination %destination (accessible via !url, actual uri=<span id="uri">@uri</span>)',
+         $this->t('Saved managed file: %file to destination %destination (accessible via :url, actual uri=<span id="uri">@uri</span>)',
             array(
               '%file' => print_r($file_data, TRUE),
               '%destination' => $uri,
               '@uri' => $file_object->getFileUri(),
-              '!url' => $this->l(t('this URL'), $url),
+              ':url' => $this->l(t('this URL'), $url),
             )
           )
         );
@@ -453,11 +453,11 @@ class FileExampleReadWriteForm extends FormBase {
       $this->setDefaultFile($filename);
       if ($url) {
         drupal_set_message(
-         $this->t('Saved file as %filename (accessible via !url, uri=<span id="uri">@uri</span>)',
+         $this->t('Saved file as %filename (accessible via :url, uri=<span id="uri">@uri</span>)',
             array(
               '%filename' => $filename,
               '@uri' => $filename,
-              '!url' => $this->l(t('this URL'), $url),
+              ':url' => $this->l(t('this URL'), $url),
             )
           )
         );
@@ -527,11 +527,11 @@ class FileExampleReadWriteForm extends FormBase {
     $this->setDefaultFile($destination);
     if ($url) {
       drupal_set_message(
-       $this->t('Saved file as %filename (accessible via !url, uri=<span id="uri">@uri</span>)',
+       $this->t('Saved file as %filename (accessible via :url, uri=<span id="uri">@uri</span>)',
           array(
             '%filename' => $destination,
             '@uri' => $destination,
-            '!url' => $this->l(t('this URL'), $url),
+            ':url' => $this->l(t('this URL'), $url),
           )
         )
       );
@@ -599,10 +599,10 @@ class FileExampleReadWriteForm extends FormBase {
           // We need to convert the URL to string. Since the URL class throws on non-routables.
           $url_string = file_create_url($url->getUri());
           drupal_set_message(
-           $this->t('The file was read and copied to %filename which is accessible at !url',
+           $this->t('The file was read and copied to %filename which is accessible at :url',
               array(
                 '%filename' => $sourcename,
-                '!url' => $this->l($url_string, $url),
+                ':url' => $this->l($url_string, $url),
               )
             )
           );