diff --git a/libraries/classes/Plugins/Transformations/Abs/ExternalTransformationsPlugin.php b/libraries/classes/Plugins/Transformations/Abs/ExternalTransformationsPlugin.php
index 1932bf306d..6e374eee3d 100644
--- a/libraries/classes/Plugins/Transformations/Abs/ExternalTransformationsPlugin.php
+++ b/libraries/classes/Plugins/Transformations/Abs/ExternalTransformationsPlugin.php
@@ -17,7 +17,6 @@ use function feof;
 use function fgets;
 use function fwrite;
 use function htmlspecialchars;
-use function is_resource;
 use function proc_close;
 use function proc_open;
 use function sprintf;
@@ -140,7 +139,7 @@ abstract class ExternalTransformationsPlugin extends TransformationsPlugin
             ],
         ];
         $process = proc_open($program . ' ' . $options[1], $descriptorspec, $pipes);
-        if (is_resource($process)) {
+        if ($process !== false) {
             fwrite($pipes[0], $buffer);
             fclose($pipes[0]);