diff --git a/include/crm/cluster/compat.h b/include/crm/cluster/compat.h
index df90c74349..7c6c70fd26 100644
--- a/include/crm/cluster/compat.h
+++ b/include/crm/cluster/compat.h
@@ -1,66 +1,66 @@
 /*
  * Copyright 2004-2024 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__CRM_CLUSTER_COMPAT__H
 #define PCMK__CRM_CLUSTER_COMPAT__H
 
 #include <crm/cluster.h>    // pcmk_cluster_t, enum pcmk_cluster_layer
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /**
  * \file
  * \brief Deprecated Pacemaker cluster API
  * \ingroup cluster
  * \deprecated Do not include this header directly. The cluster APIs in this
  *             header, and the header itself, will be removed in a future
  *             release.
  */
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Use \c pcmk_cluster_t instead
-typedef pcmk_cluster_t crm_cluster_t;
+typedef struct crm_cluster_s crm_cluster_t;
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Use \c pcmk_cluster_connect() instead
 gboolean crm_cluster_connect(pcmk_cluster_t *cluster);
 
 // NOTE: sbd (as of at least 1.5.2) uses this enum
 //!@{
 //! \deprecated Use <tt>enum pcmk_cluster_layer</tt> instead
 enum cluster_type_e {
     // NOTE: sbd (as of at least 1.5.2) uses this value
     pcmk_cluster_unknown    = pcmk_cluster_layer_unknown,
 
     pcmk_cluster_invalid    = pcmk_cluster_layer_invalid,
 
     // NOTE: sbd (as of at least 1.5.2) uses this value
     pcmk_cluster_corosync   = pcmk_cluster_layer_corosync,
 };
 //!@}
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Use \c pcmk_cluster_layer_text() instead
 const char *name_for_cluster_type(enum cluster_type_e type);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Use \c pcmk_get_cluster_layer() instead
 enum cluster_type_e get_cluster_type(void);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Do not use
 void crm_peer_init(void);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // PCMK_CLUSTER_COMPAT__H