--- a/lib/util/include/bool.h
+++ b/lib/util/include/bool.h
@@ -5,7 +5,11 @@
    collision.
 */
 
-#ifndef __cplusplus
+#ifdef __cplusplus
+/* bool has always been part of the C++ language */
+#elif __STDC_VERSION__ >= 202311L
+/* bool is part of the C23 standard */
+#else
 /* At least the GNU compiler defines __bool_true_false_are_defined */
 #ifndef __bool_true_false_are_defined
 #define __bool_true_false_are_defined