diff --git a/addressbook/inc/class.addressbook_vcal.inc.php b/addressbook/inc/class.addressbook_vcal.inc.php
index b734b67667..e9508342d4 100644
--- a/addressbook/inc/class.addressbook_vcal.inc.php
+++ b/addressbook/inc/class.addressbook_vcal.inc.php
@@ -369,7 +369,7 @@ class addressbook_vcal extends addressbook_bo
 								}
 								elseif (!$extra_charset_attribute)
 								{
-									$options['ENCODING'] = '';
+									unset($options['ENCODING']);
 								}
 							}
 							$hasdata++;
@@ -448,7 +448,7 @@ class addressbook_vcal extends addressbook_bo
 								}
 								elseif (!$extra_charset_attribute)
 								{
-									$options['ENCODING'] = '';
+									unset($options['ENCODING']);
 								}
 							}
 							if ($vcardField == 'TEL' && $entry['tel_prefer'] &&