diff --git a/geometry/r3_element.hpp b/geometry/r3_element.hpp
index 7f6d62b425..17606e700d 100644
--- a/geometry/r3_element.hpp
+++ b/geometry/r3_element.hpp
@@ -19,9 +19,9 @@ namespace internal {
 
 using namespace principia::base::_not_null;
 using namespace principia::base::_tags;
+using namespace principia::quantities::_concepts;
 using namespace principia::quantities::_named_quantities;
 using namespace principia::quantities::_quantities;
-using namespace principia::quantities::_concepts;
 
 template<typename Scalar>
 struct SphericalCoordinates;
diff --git a/numerics/double_precision_body.hpp b/numerics/double_precision_body.hpp
index 1ff5311815..271706b1a5 100644
--- a/numerics/double_precision_body.hpp
+++ b/numerics/double_precision_body.hpp
@@ -30,9 +30,9 @@ using namespace principia::geometry::_point;
 using namespace principia::geometry::_r3_element;
 using namespace principia::geometry::_serialization;
 using namespace principia::numerics::_fma;
+using namespace principia::quantities::_concepts;
 using namespace principia::quantities::_elementary_functions;
 using namespace principia::quantities::_si;
-using namespace principia::quantities::_concepts;
 
 // A helper to check that the preconditions of QuickTwoSum are met.  Annoyingly
 // complicated as it needs to peel off all of our abstractions until it reaches
diff --git a/quantities/concepts.hpp b/quantities/concepts.hpp
index 7991bd8b0a..ef4b0e0b9f 100644
--- a/quantities/concepts.hpp
+++ b/quantities/concepts.hpp
@@ -23,4 +23,4 @@ using internal::quantity;
 
 }  // namespace _concepts
 }  // namespace quantities
-}  // namespace principia
\ No newline at end of file
+}  // namespace principia
diff --git a/quantities/concepts_test.cpp b/quantities/concepts_test.cpp
index 066cffede4..b152ae72ee 100644
--- a/quantities/concepts_test.cpp
+++ b/quantities/concepts_test.cpp
@@ -6,8 +6,8 @@
 namespace principia {
 namespace quantities {
 
-using namespace principia::quantities::_named_quantities;
 using namespace principia::quantities::_concepts;
+using namespace principia::quantities::_named_quantities;
 
 TEST(Traits, IsQuantityV) {
   static_assert(quantity<int>);