diff --git a/include/crm/crm_compat.h b/include/crm/crm_compat.h
index 4b3d0a025f..79c66ec49e 100644
--- a/include/crm/crm_compat.h
+++ b/include/crm/crm_compat.h
@@ -1,55 +1,53 @@
 /*
  * Copyright 2004-2021 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_COMPAT__H
 #  define PCMK__CRM_COMPAT__H
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /**
  * \file
  * \brief Deprecated Pacemaker utilities
  * \ingroup core
  * \deprecated Do not include this header directly. The utilities in this
  *             header, and the header itself, will be removed in a future
  *             release.
  */
 
 //! \deprecated Use '\0' instead
 #define EOS '\0'
 
 //! \deprecated This defined constant will be removed in a future release
 #define MAX_IPC_DELAY 120
 
 //!@{
 //! \deprecated This macro will be removed in a future release
 
-#define DIMOF(a) ((int) (sizeof(a)/sizeof(a[0])))
-
 #  ifndef __GNUC__
 #    define __builtin_expect(expr, result) (expr)
 #  endif
 
 #define __likely(expr) __builtin_expect(expr, 1)
 
 #define __unlikely(expr) __builtin_expect(expr, 0)
 
 // This ends the doxygen deprecation comment
 //!@}
 
 //! \deprecated Use GList * instead
 typedef GList *GListPtr;
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // PCMK__CRM_COMPAT__H