diff --git a/tests/SelfTest/UsageTests/Tricky.tests.cpp b/tests/SelfTest/UsageTests/Tricky.tests.cpp
index e9803c76..9fe4779d 100644
--- a/tests/SelfTest/UsageTests/Tricky.tests.cpp
+++ b/tests/SelfTest/UsageTests/Tricky.tests.cpp
@@ -14,7 +14,7 @@
 
 #include <catch2/catch_test_macros.hpp>
 
-#include <stdio.h>
+#include <cstdio>
 #include <sstream>
 #include <iostream>