diff --git a/geometry/grassmann_test.cpp b/geometry/grassmann_test.cpp
index c19271a808..66f78e2854 100644
--- a/geometry/grassmann_test.cpp
+++ b/geometry/grassmann_test.cpp
@@ -296,9 +296,10 @@ TEST_F(GrassmannTest, Normalize) {
 
 using F = Frame<struct FrameTag>;
 
-PRINCIPIA_CHECK_WELL_FORMED(v.WriteToMessage(&message),
-                            with_variable<Vector<Length, GrassmannTest::World>> v,
-                            with_variable<serialization::Multivector> message);
+PRINCIPIA_CHECK_WELL_FORMED(
+    v.WriteToMessage(&message),
+    with_variable<Vector<Length, GrassmannTest::World>> v,
+    with_variable<serialization::Multivector> message);
 // TODO(phl): We should refuse to serialize these at compile time; right now
 // only deserialization fails.
 PRINCIPIA_CHECK_WELL_FORMED(v.WriteToMessage(&message),
diff --git a/numerics/polynomial_in_monomial_basis_test.cpp b/numerics/polynomial_in_monomial_basis_test.cpp
index 90a3ea39c0..10f2ba09d6 100644
--- a/numerics/polynomial_in_monomial_basis_test.cpp
+++ b/numerics/polynomial_in_monomial_basis_test.cpp
@@ -150,8 +150,9 @@ TEST_F(PolynomialInMonomialBasisTest, Evaluate2P) {
                                                0 * Metre / Second}), 0));
 }
 
-PRINCIPIA_CHECK_WELL_FORMED(p.Primitive(),
-                            with_variable<PolynomialInMonomialBasisTest::P2A> p);
+PRINCIPIA_CHECK_WELL_FORMED(
+    p.Primitive(),
+    with_variable<PolynomialInMonomialBasisTest::P2A> p);
 PRINCIPIA_CHECK_ILL_FORMED(p.Primitive(),
                            with_variable<PolynomialInMonomialBasisTest::P2P> p);
 
diff --git a/testing_utilities/check_well_formedness_test.cpp b/testing_utilities/check_well_formedness_test.cpp
index 9d3b0bc835..18f076fdec 100644
--- a/testing_utilities/check_well_formedness_test.cpp
+++ b/testing_utilities/check_well_formedness_test.cpp
@@ -5,5 +5,9 @@
 
 PRINCIPIA_CHECK_ILL_FORMED(s + 3, with_variable<std::string> s);
 PRINCIPIA_CHECK_ILL_FORMED(s + "3", with_variable<std::pair<double, double>> s);
-PRINCIPIA_CHECK_WELL_FORMED(s + t, with_variable<std::string> s, with_variable<std::string> t);
-PRINCIPIA_CHECK_ILL_FORMED(s - t, with_variable<std::string> s, with_variable<std::string> t);
+PRINCIPIA_CHECK_WELL_FORMED(s + t,
+                            with_variable<std::string> s,
+                            with_variable<std::string> t);
+PRINCIPIA_CHECK_ILL_FORMED(s - t,
+                           with_variable<std::string> s,
+                           with_variable<std::string> t);