diff --git a/site/profiles/manifests/vault/server.pp b/site/profiles/manifests/vault/server.pp
index 665b2ea..3a7ecff 100644
--- a/site/profiles/manifests/vault/server.pp
+++ b/site/profiles/manifests/vault/server.pp
@@ -130,6 +130,20 @@ class profiles::vault::server (
       mode   => '0600',
     }
 
+    # go-plugin creates each secrets plugin's control socket under TMPDIR
+    # (/tmp/pluginNNN by default); systemd-tmpfiles-clean reaps aged /tmp files
+    # and severs the socket of a long-lived plugin, orphaning the process. Point
+    # TMPDIR at a per-start RuntimeDirectory on /run (tmpfs, no age cleanup).
+    systemd::manage_dropin { 'plugin-tmpdir.conf':
+      unit          => 'vault.service',
+      service_entry => {
+        'RuntimeDirectory'     => 'vault-plugins',
+        'RuntimeDirectoryMode' => '0700',
+        'Environment'          => 'TMPDIR=/run/vault-plugins',
+      },
+      notify        => Service['vault'],
+    }
+
     service { 'vault':
       ensure    => true,
       enable    => true,