diff --git a/build_tests/helloworld.cc b/build_tests/helloworld.cc
index c034e96..f12349e 100644
--- a/build_tests/helloworld.cc
+++ b/build_tests/helloworld.cc
@@ -1,5 +1,3 @@
-#include <stdio.h>
+#include <cstdio>
 
-int main() {
-  printf("Hello, World!\n");
-}
+int main() { printf("Hello, World!\n"); }