diff --git a/numerics/osaca.hpp b/numerics/osaca.hpp
index 007fe19867..33f29c82f6 100644
--- a/numerics/osaca.hpp
+++ b/numerics/osaca.hpp
@@ -2,7 +2,7 @@
 
 #include "base/macros.hpp"
 
-#define PRINCIPIA_USE_OSACA 1
+#define PRINCIPIA_USE_OSACA 0
 
 // 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