diff --git a/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt b/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt
index 594980ec0f8..81c15d53b84 100644
--- a/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt
+++ b/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt
@@ -4,6 +4,9 @@ mysqli_fetch_all() data types variation
 mysqli
 --SKIPIF--
 <?php
+if (getenv('GITHUB_ACTIONS') && str_starts_with(php_uname('m'), 'ppc')) {
+    die('skip Flaky on GitHub Actions PPC runner');
+}
 require_once dirname(__DIR__) . "/test_setup/test_helpers.inc";
 mysqli_check_skip_test();
 ?>
diff --git a/ext/standard/tests/general_functions/proc_open_multiplex.phpt b/ext/standard/tests/general_functions/proc_open_multiplex.phpt
index 63e856b29c3..798b5e74c47 100644
--- a/ext/standard/tests/general_functions/proc_open_multiplex.phpt
+++ b/ext/standard/tests/general_functions/proc_open_multiplex.phpt
@@ -1,5 +1,11 @@
 --TEST--
 Multiplexing of child output
+--SKIPIF--
+<?php
+if (getenv('GITHUB_ACTIONS') && str_starts_with(php_uname('m'), 'ppc')) {
+    die('skip Flaky on GitHub Actions PPC runner');
+}
+?>
 --FILE--
 <?php
 $php = getenv("TEST_PHP_EXECUTABLE");