diff --git a/test/fake.cpp b/test/fake.cpp
index cc1e1d81..61e504af 100644
--- a/test/fake.cpp
+++ b/test/fake.cpp
@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include <cstdio>
 
 extern "C" int fake_func(double *);