diff --git a/lets_do_dns/acme_dns_auth/authenticate.py b/lets_do_dns/acme_dns_auth/authenticate.py
index 3b75e87..7e915af 100644
--- a/lets_do_dns/acme_dns_auth/authenticate.py
+++ b/lets_do_dns/acme_dns_auth/authenticate.py
@@ -40,7 +40,10 @@ def _delete_resource(self):
     def _run_post_cmd(self):
         if self._env.post_cmd:
             run(self._env.post_cmd,
-                env={'CERTBOT_HOSTNAME': self._env.fqdn})
+                env={'CERTBOT_HOSTNAME': self._env.fqdn,
+                     'PATH': ["/bin", "/sbin",
+                              "/usr/bin", "/usr/sbin",
+                              "/usr/local/bin", "/usr/local/sbin"]})
 
     def _create_resource(self):
         self._resource.create()
diff --git a/tests/unit/acme_dns_auth/authenticate/test_cleanup_stage.py b/tests/unit/acme_dns_auth/authenticate/test_cleanup_stage.py
index 1281b6d..3601713 100644
--- a/tests/unit/acme_dns_auth/authenticate/test_cleanup_stage.py
+++ b/tests/unit/acme_dns_auth/authenticate/test_cleanup_stage.py
@@ -73,4 +73,8 @@ def test_passes_postcmd_to_run(mocker, fqdn):
     authentication.perform()
 
     mock_run.assert_called_once_with(
-        'test-program --help', env={'CERTBOT_HOSTNAME': fqdn})
+        'test-program --help',
+        env={'CERTBOT_HOSTNAME': fqdn,
+             'PATH': ["/bin", "/sbin",
+                      "/usr/bin", "/usr/sbin",
+                      "/usr/local/bin", "/usr/local/sbin"]})