diff --git a/include/crm/common/acl.h b/include/crm/common/acl.h
index ef92ddf9a1..cd465c0a4c 100644
--- a/include/crm/common/acl.h
+++ b/include/crm/common/acl.h
@@ -1,33 +1,37 @@
 /*
  * Copyright 2004-2020 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #ifndef PCMK__COMMON_ACL__H
 #  define PCMK__COMMON_ACL__H
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /**
  * \file
  * \brief Low-level API for XML Access Control Lists (ACLs)
  * \ingroup core
  */
 
 #  include <libxml/tree.h> // xmlNode
 
 bool xml_acl_enabled(xmlNode *xml);
 void xml_acl_disable(xmlNode *xml);
 bool xml_acl_denied(xmlNode *xml);
 bool xml_acl_filtered_copy(const char *user, xmlNode* acl_source, xmlNode *xml,
                            xmlNode **result);
 
 bool pcmk_acl_required(const char *user);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // PCMK__COMMON_ACL__H