diff --git a/numerics/cbrt.cpp b/numerics/cbrt.cpp
index 6dfcab7d98..370f0e6480 100644
--- a/numerics/cbrt.cpp
+++ b/numerics/cbrt.cpp
@@ -141,7 +141,7 @@
 // Set OSACA_CARRY_LOOP_THROUGH_REGISTER to 0 to carry the loop through memory.
 
 #define OSACA_EVALUATE_CONDITIONS 1
-#define OSACA_CARRY_LOOP_THROUGH_REGISTER 0
+#define OSACA_CARRY_LOOP_THROUGH_REGISTER 1
 
 static bool volatile OSACA_loop_terminator = false;
 
diff --git a/quantities/elementary_functions_body.hpp b/quantities/elementary_functions_body.hpp
index 1c1345e929..89cee08261 100644
--- a/quantities/elementary_functions_body.hpp
+++ b/quantities/elementary_functions_body.hpp
@@ -94,7 +94,7 @@ Q Mod(Q const& argument, Q const& modulus) {
 
 template<typename Q>
 SquareRoot<Q> Sqrt(Q const& x) {
-#if PRINCIPIA_USE_SSE3_INTRINSICS
+#if PRINCIPIA_USE_SSE3_INTRINSICS()
   auto const x_128d = _mm_set_sd(x / si::Unit<Q>);
   return si::Unit<SquareRoot<Q>> * _mm_cvtsd_f64(_mm_sqrt_sd(x_128d, x_128d));
 #else