diff -urN opendnssec-2.1.13.orig/enforcer/src/db/db_backend_mysql.c opendnssec-2.1.13/enforcer/src/db/db_backend_mysql.c
--- opendnssec-2.1.13.orig/enforcer/src/db/db_backend_mysql.c	2023-06-26 13:24:05.000000000 +0200
+++ opendnssec-2.1.13/enforcer/src/db/db_backend_mysql.c	2023-12-04 08:39:37.685365824 +0100
@@ -72,7 +72,7 @@
     db_backend_mysql_bind_t* next;
     MYSQL_BIND* bind;
     unsigned long length;
-    my_bool error;
+    _Bool error;
     int value_enum;
 };
 
@@ -270,7 +270,7 @@
             }
 
             bind->bind = (mysql_bind = &((*statement)->mysql_bind_output[i]));
-            mysql_bind->is_null = (my_bool*)0;
+            mysql_bind->is_null = (_Bool*)0;
             mysql_bind->error = &bind->error;
             mysql_bind->length = &bind->length;
 
@@ -959,7 +959,7 @@
         }
 
         (*bind)->bind->length = &((*bind)->bind->buffer_length);
-        (*bind)->bind->is_null = (my_bool*)0;
+        (*bind)->bind->is_null = (_Bool*)0;
 
         switch (db_clause_type(clause)) {
         case DB_CLAUSE_EQUAL:
@@ -1079,7 +1079,7 @@
     }
 
     bind->bind->length = &(bind->bind->buffer_length);
-    bind->bind->is_null = (my_bool*)0;
+    bind->bind->is_null = (_Bool*)0;
 
     switch (db_value_type(value)) {
     case DB_TYPE_PRIMARY_KEY: