diff --git a/include/crm/pengine/pe_types_compat.h b/include/crm/pengine/pe_types_compat.h
index 63313649c4..1d70fe3132 100644
--- a/include/crm/pengine/pe_types_compat.h
+++ b/include/crm/pengine/pe_types_compat.h
@@ -1,56 +1,57 @@
 /*
- * Copyright 2004-2024 the Pacemaker project contributors
+ * Copyright 2004-2025 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_PENGINE_PE_TYPES_COMPAT__H
 #  define PCMK__CRM_PENGINE_PE_TYPES_COMPAT__H
 
+#include <stdint.h>                // UINT64_C
 #include <crm/common/scheduler.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /**
  * \file
  * \brief Deprecated Pacemaker scheduler API
  * \ingroup pengine
  * \deprecated Do not include this header directly. The scheduler 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 Do not use
-#define pe_rsc_managed                  (1ULL << 1)
+#define pe_rsc_managed                  (UINT64_C(1) << 1)
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Do not use
-#define pe_flag_have_quorum             (1ULL << 0)
+#define pe_flag_have_quorum             (UINT64_C(1) << 0)
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Do not use
-#define pe_flag_have_stonith_resource   (1ULL << 5)
+#define pe_flag_have_stonith_resource   (UINT64_C(1) << 5)
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Use pcmk_node_t instead
 typedef struct pcmk__scored_node node_t;
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated use pcmk_resource_t instead
 typedef struct pcmk__resource resource_t;
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 //! \deprecated Use pcmk_scheduler_t instead
 typedef struct pcmk__scheduler pe_working_set_t;
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // PCMK__CRM_PENGINE_PE_TYPES_COMPAT__H