diff --git a/libraries/transformations/image_jpeg__inline.inc.php b/libraries/transformations/image_jpeg__inline.inc.php
index 066c74725..715621c15 100644
--- a/libraries/transformations/image_jpeg__inline.inc.php
+++ b/libraries/transformations/image_jpeg__inline.inc.php
@@ -3,7 +3,7 @@
 // vim: expandtab sw=4 ts=4 sts=4:
 
 function PMA_transformation_image_jpeg__inline($buffer, $options = array(), $meta = '') {
-    include('./libraries/transformations/global.inc.php');
+    require_once('./libraries/transformations/global.inc.php');
 
     if (PMA_IS_GD2) {
         $transform_options = array ('string' => '<a href="transformation_wrapper.php' . $options['wrapper_link'] . '" target="_blank"><img src="transformation_wrapper.php' . $options['wrapper_link'] . '&amp;resize=jpeg&amp;newWidth=' . (isset($options[0]) ? $options[0] : '100') . '&amp;newHeight=' . (isset($options[1]) ? $options[1] : 100) . '" alt="[__BUFFER__]" border="0"></a>');
diff --git a/libraries/transformations/image_jpeg__link.inc.php b/libraries/transformations/image_jpeg__link.inc.php
index b4942ccda..09c929fbb 100644
--- a/libraries/transformations/image_jpeg__link.inc.php
+++ b/libraries/transformations/image_jpeg__link.inc.php
@@ -3,7 +3,7 @@
 // vim: expandtab sw=4 ts=4 sts=4:
 
 function PMA_transformation_image_jpeg__link($buffer, $options = array(), $meta = '') {
-    include('./libraries/transformations/global.inc.php');
+    require_once('./libraries/transformations/global.inc.php');
 
     $transform_options = array ('string' => '<a href="transformation_wrapper.php' . $options['wrapper_link'] . '" alt="[__BUFFER__]">[BLOB]</a>');
     $buffer = PMA_transformation_global_html_replace($buffer, $transform_options);
diff --git a/libraries/transformations/image_png__inline.inc.php b/libraries/transformations/image_png__inline.inc.php
index 1f1d07d74..f3503bfc2 100644
--- a/libraries/transformations/image_png__inline.inc.php
+++ b/libraries/transformations/image_png__inline.inc.php
@@ -3,7 +3,7 @@
 // vim: expandtab sw=4 ts=4 sts=4:
 
 function PMA_transformation_image_png__inline($buffer, $options = array(), $meta = '') {
-    include('./libraries/transformations/global.inc.php');
+    require_once('./libraries/transformations/global.inc.php');
 
     if (PMA_IS_GD2) {
         $transform_options = array ('string' => '<a href="transformation_wrapper.php' . $options['wrapper_link'] . '" target="_blank"><img src="transformation_wrapper.php' . $options['wrapper_link'] . '&amp;resize=png&amp;newWidth=' . (isset($options[0]) ? $options[0] : '100') . '&amp;newHeight=' . (isset($options[1]) ? $options[1] : 100) . '" alt="[__BUFFER__]" border="0"></a>');
diff --git a/libraries/transformations/text_plain__imagelink.inc.php b/libraries/transformations/text_plain__imagelink.inc.php
index 20888b3aa..11d3fd679 100644
--- a/libraries/transformations/text_plain__imagelink.inc.php
+++ b/libraries/transformations/text_plain__imagelink.inc.php
@@ -3,7 +3,7 @@
 // vim: expandtab sw=4 ts=4 sts=4:
 
 function PMA_transformation_text_plain__imagelink($buffer, $options = array(), $meta = '') {
-    include('./libraries/transformations/global.inc.php');
+    require_once('./libraries/transformations/global.inc.php');
 
     $transform_options = array ('string' => '<a href="' . (isset($options[0]) ? $options[0] : '') . $buffer . '" target="_blank"><img src="' . (isset($options[0]) ? $options[0] : '') . $buffer . '" border="0" width="' . (isset($options[1]) ? $options[1] : 100) . '" height="' . (isset($options[2]) ? $options[2] : 50) . '">' . $buffer . '</a>');
     $buffer = PMA_transformation_global_html_replace($buffer, $transform_options);