diff --git a/ext/standard/tests/general_functions/proc_open_multiplex.phpt b/ext/standard/tests/general_functions/proc_open_multiplex.phpt
deleted file mode 100644
index 704b0a50660..00000000000
--- a/ext/standard/tests/general_functions/proc_open_multiplex.phpt
+++ /dev/null
@@ -1,37 +0,0 @@
---TEST--
-Multiplexing of child output
---FILE--
-<?php
-$php = getenv("TEST_PHP_EXECUTABLE");
-$desc = [
-    ["null"],
-    ["pipe", "w"],
-    ["null"]
-];
-$read_pipes = [];
-for ($i = 0; $i < 10; $i++) {
-    $procs[] = proc_open([$php, "-r", "usleep(100000 * (10 - $i)); echo 'hello$i';"], $desc, $pipes);
-    $read_pipes[] = $pipes[1];
-}
-$rset = $read_pipes;
-$wset = null;
-$eset = null;
-while (!empty($read_pipes) && stream_select($rset, $wset, $eset, 2) > 0) {
-    foreach ($rset as $pipe) {
-        echo fread($pipe, 6), "\n";
-        unset($read_pipes[array_search($pipe, $read_pipes)]);
-    }
-    $rset = $read_pipes;
-}
-?>
---EXPECT--
-hello9
-hello8
-hello7
-hello6
-hello5
-hello4
-hello3
-hello2
-hello1
-hello0