diff --git a/plugins/kolab_files/kolab_files.js b/plugins/kolab_files/kolab_files.js
index 82dc2f17..90febcb1 100644
--- a/plugins/kolab_files/kolab_files.js
+++ b/plugins/kolab_files/kolab_files.js
@@ -535,7 +535,9 @@ function kolab_files_file_rename_dialog(file)
   kolab_dialog_show(dialog, {
     title: rcmail.gettext('kolab_files.renamefile'),
     buttons: buttons,
-    button_classes: ['mainaction']
+    button_classes: ['mainaction'],
+    minHeight: 100,
+    height: 200
   });
 };
 
diff --git a/plugins/kolab_files/lib/kolab_files_engine.php b/plugins/kolab_files/lib/kolab_files_engine.php
index e21e4519..427353df 100644
--- a/plugins/kolab_files/lib/kolab_files_engine.php
+++ b/plugins/kolab_files/lib/kolab_files_engine.php
@@ -338,7 +338,7 @@ class kolab_files_engine
             $attrib['id'] = 'file-rename-form';
         }
 
-        $input_name = new html_inputfield(array('id' => 'file-rename-name', 'name' => 'name', 'size' => 30));
+        $input_name = new html_inputfield(array('id' => 'file-rename-name', 'name' => 'name', 'size' => 50));
         $table      = new html_table(array('cols' => 2, 'class' => 'propform'));
 
         $table->add('title', html::label('file-rename-name', rcube::Q($this->plugin->gettext('filename'))));