diff --git a/examples/reading_logs_via_rule_message/reading_logs_via_rule_message.h b/examples/reading_logs_via_rule_message/reading_logs_via_rule_message.h
index 3aae5356..29e4d662 100644
--- a/examples/reading_logs_via_rule_message/reading_logs_via_rule_message.h
+++ b/examples/reading_logs_via_rule_message/reading_logs_via_rule_message.h
@@ -102,7 +102,7 @@ struct data_ms {
         delete modsecTransaction;
     }
 
-    pthread_exit(NULL);
+    pthread_exit(nullptr);
 }