diff --git a/numerics/osaca.hpp b/numerics/osaca.hpp
index 33f29c82f6..efb8d947c4 100644
--- a/numerics/osaca.hpp
+++ b/numerics/osaca.hpp
@@ -1,8 +1,6 @@
 #pragma once
 
-#include "base/macros.hpp"
-
-#define PRINCIPIA_USE_OSACA 0
+#define PRINCIPIA_USE_OSACA 1
 
 // The macros OSACA_FUNCTION_BEGIN and OSACA_RETURN are used to analyse the
 // latency of a double -> double function, as measured, e.g., by the