diff --git a/test/header_only/include/header_only/adder.h b/test/header_only/include/header_only/adder.h
index 541562f..6811804 100644
--- a/test/header_only/include/header_only/adder.h
+++ b/test/header_only/include/header_only/adder.h
@@ -1,5 +1,3 @@
 #pragma once
 
-inline constexpr long add(int a, int b) {
-  return a + b;
-}
+inline constexpr long add(int a, int b) { return a + b; }