diff --git a/include/simpleplugin/attributes/class_PhoneNumberAttribute.inc b/include/simpleplugin/attributes/class_PhoneNumberAttribute.inc
index 047c58dd18512567620d69ed773f3bec4a024e93..320c7a5842188dd6b0d3806358f0aad68d737315 100644
--- a/include/simpleplugin/attributes/class_PhoneNumberAttribute.inc
+++ b/include/simpleplugin/attributes/class_PhoneNumberAttribute.inc
@@ -139,7 +139,7 @@ class PhoneNumberButtonAttribute extends PhoneNumberAttribute
       $display .= $this->renderAcl($this->renderInputField(
         'image', $id.'_edit',
         array(
-          'class' => 'center',
+          'class' => 'center dialog',
           'src'   => 'geticon.php?context=actions&icon=document-edit&size=16',
           'title' => _('Edit'),
           'alt'   => _('Edit')