diff --git a/ext/posix/tests/posix_getgrnam_basic.phpt b/ext/posix/tests/posix_getgrnam_basic.phpt
index acf8f4473e5..86e2dd390b4 100644
--- a/ext/posix/tests/posix_getgrnam_basic.phpt
+++ b/ext/posix/tests/posix_getgrnam_basic.phpt
@@ -4,7 +4,10 @@ Test posix_getgrnam() function : basic functionality
 posix
 --SKIPIF--
 <?php
-    if (!posix_getgroups()) die('skip - groups unavailable (ci)');
+if (!posix_getgroups()) die('skip - groups unavailable (ci)');
+if (getenv("GITHUB_ACTIONS") && PHP_OS_FAMILY === "Darwin") {
+    die("flaky Occasionally segfaults on macOS for unknown reasons");
+}
 ?>
 --FILE--
 <?php
diff --git a/ext/posix/tests/posix_getgroups_basic.phpt b/ext/posix/tests/posix_getgroups_basic.phpt
index 06ca1a96ae2..165e300c47d 100644
--- a/ext/posix/tests/posix_getgroups_basic.phpt
+++ b/ext/posix/tests/posix_getgroups_basic.phpt
@@ -2,6 +2,12 @@
 Test posix_getgroups() function : basic functionality
 --EXTENSIONS--
 posix
+--SKIPIF--
+<?php
+if (getenv("GITHUB_ACTIONS") && PHP_OS_FAMILY === "Darwin") {
+    die("flaky Occasionally segfaults on macOS for unknown reasons");
+}
+?>
 --FILE--
 <?php
   echo "Basic test of POSIX getgroups\n";