diff --git a/src/stan/services/sample/hmc_nuts_dense_e.hpp b/src/stan/services/sample/hmc_nuts_dense_e.hpp
index d582e1c6c6..73e0a2af1d 100644
--- a/src/stan/services/sample/hmc_nuts_dense_e.hpp
+++ b/src/stan/services/sample/hmc_nuts_dense_e.hpp
@@ -123,7 +123,8 @@ int hmc_nuts_dense_e(Model& model, const stan::io::var_context& init,
                      callbacks::writer& init_writer,
                      callbacks::writer& sample_writer,
                      callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_dense_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_dense_inv_metric(model.num_params_r());
   return hmc_nuts_dense_e(model, init, default_metric, random_seed, chain,
                           init_radius, num_warmup, num_samples, num_thin,
                           save_warmup, refresh, stepsize, stepsize_jitter,
diff --git a/src/stan/services/sample/hmc_nuts_dense_e_adapt.hpp b/src/stan/services/sample/hmc_nuts_dense_e_adapt.hpp
index 95bca2bff7..913c50152a 100644
--- a/src/stan/services/sample/hmc_nuts_dense_e_adapt.hpp
+++ b/src/stan/services/sample/hmc_nuts_dense_e_adapt.hpp
@@ -206,7 +206,8 @@ int hmc_nuts_dense_e_adapt(
     callbacks::logger& logger, callbacks::writer& init_writer,
     callbacks::writer& sample_writer, callbacks::writer& diagnostic_writer,
     callbacks::structured_writer& metric_writer) {
-  auto default_metric = util::create_unit_e_dense_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_dense_inv_metric(model.num_params_r());
   return hmc_nuts_dense_e_adapt(
       model, init, default_metric, random_seed, chain, init_radius, num_warmup,
       num_samples, num_thin, save_warmup, refresh, stepsize, stepsize_jitter,
@@ -257,7 +258,8 @@ int hmc_nuts_dense_e_adapt(
     unsigned int window, callbacks::interrupt& interrupt,
     callbacks::logger& logger, callbacks::writer& init_writer,
     callbacks::writer& sample_writer, callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_dense_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_dense_inv_metric(model.num_params_r());
   callbacks::structured_writer dummy_metric_writer;
   return hmc_nuts_dense_e_adapt(
       model, init, default_metric, random_seed, chain, init_radius, num_warmup,
diff --git a/src/stan/services/sample/hmc_nuts_diag_e.hpp b/src/stan/services/sample/hmc_nuts_diag_e.hpp
index 17f6f86428..e693ed0a83 100644
--- a/src/stan/services/sample/hmc_nuts_diag_e.hpp
+++ b/src/stan/services/sample/hmc_nuts_diag_e.hpp
@@ -121,7 +121,8 @@ int hmc_nuts_diag_e(Model& model, const stan::io::var_context& init,
                     callbacks::writer& init_writer,
                     callbacks::writer& sample_writer,
                     callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_diag_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_diag_inv_metric(model.num_params_r());
   return hmc_nuts_diag_e(model, init, default_metric, random_seed, chain,
                          init_radius, num_warmup, num_samples, num_thin,
                          save_warmup, refresh, stepsize, stepsize_jitter,
diff --git a/src/stan/services/sample/hmc_static_dense_e.hpp b/src/stan/services/sample/hmc_static_dense_e.hpp
index 962441912d..c337636f9c 100644
--- a/src/stan/services/sample/hmc_static_dense_e.hpp
+++ b/src/stan/services/sample/hmc_static_dense_e.hpp
@@ -116,7 +116,8 @@ int hmc_static_dense_e(
     double stepsize_jitter, double int_time, callbacks::interrupt& interrupt,
     callbacks::logger& logger, callbacks::writer& init_writer,
     callbacks::writer& sample_writer, callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_dense_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_dense_inv_metric(model.num_params_r());
   return hmc_static_dense_e(model, init, default_metric, random_seed, chain,
                             init_radius, num_warmup, num_samples, num_thin,
                             save_warmup, refresh, stepsize, stepsize_jitter,
diff --git a/src/stan/services/sample/hmc_static_dense_e_adapt.hpp b/src/stan/services/sample/hmc_static_dense_e_adapt.hpp
index f1027ca837..21bd6d711d 100644
--- a/src/stan/services/sample/hmc_static_dense_e_adapt.hpp
+++ b/src/stan/services/sample/hmc_static_dense_e_adapt.hpp
@@ -148,7 +148,8 @@ int hmc_static_dense_e_adapt(
     unsigned int window, callbacks::interrupt& interrupt,
     callbacks::logger& logger, callbacks::writer& init_writer,
     callbacks::writer& sample_writer, callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_dense_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_dense_inv_metric(model.num_params_r());
 
   return hmc_static_dense_e_adapt(
       model, init, default_metric, random_seed, chain, init_radius, num_warmup,
diff --git a/src/stan/services/sample/hmc_static_diag_e.hpp b/src/stan/services/sample/hmc_static_diag_e.hpp
index 2c1733d2cc..87ea955f84 100644
--- a/src/stan/services/sample/hmc_static_diag_e.hpp
+++ b/src/stan/services/sample/hmc_static_diag_e.hpp
@@ -121,7 +121,8 @@ int hmc_static_diag_e(Model& model, const stan::io::var_context& init,
                       callbacks::logger& logger, callbacks::writer& init_writer,
                       callbacks::writer& sample_writer,
                       callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_diag_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_diag_inv_metric(model.num_params_r());
 
   return hmc_static_diag_e(model, init, default_metric, random_seed, chain,
                            init_radius, num_warmup, num_samples, num_thin,
diff --git a/src/stan/services/sample/hmc_static_diag_e_adapt.hpp b/src/stan/services/sample/hmc_static_diag_e_adapt.hpp
index 1b6c0b566c..88979dc341 100644
--- a/src/stan/services/sample/hmc_static_diag_e_adapt.hpp
+++ b/src/stan/services/sample/hmc_static_diag_e_adapt.hpp
@@ -146,7 +146,8 @@ int hmc_static_diag_e_adapt(
     unsigned int window, callbacks::interrupt& interrupt,
     callbacks::logger& logger, callbacks::writer& init_writer,
     callbacks::writer& sample_writer, callbacks::writer& diagnostic_writer) {
-  auto default_metric = util::create_unit_e_diag_inv_metric(model.num_params_r());
+  auto default_metric
+      = util::create_unit_e_diag_inv_metric(model.num_params_r());
 
   return hmc_static_diag_e_adapt(
       model, init, default_metric, random_seed, chain, init_radius, num_warmup,
diff --git a/src/test/unit/services/util/inv_metric_test.cpp b/src/test/unit/services/util/inv_metric_test.cpp
index 78542890eb..0c2f3888e1 100644
--- a/src/test/unit/services/util/inv_metric_test.cpp
+++ b/src/test/unit/services/util/inv_metric_test.cpp
@@ -18,7 +18,8 @@ TEST(inv_metric, create_diag_sz0) {
 }
 
 TEST(inv_metric, create_diag_sz100) {
-  auto default_metric = stan::services::util::create_unit_e_diag_inv_metric(100);
+  auto default_metric
+      = stan::services::util::create_unit_e_diag_inv_metric(100);
   stan::io::var_context& inv_inv_metric = default_metric;
   std::vector<double> diag_vals = inv_inv_metric.vals_r("inv_metric");
   EXPECT_EQ(100, diag_vals.size());
@@ -52,7 +53,8 @@ TEST(inv_metric, create_dense_sz3) {
 }
 
 TEST(inv_metric, create_dense_sz10) {
-  auto default_metric = stan::services::util::create_unit_e_dense_inv_metric(10);
+  auto default_metric
+      = stan::services::util::create_unit_e_dense_inv_metric(10);
   stan::io::var_context& inv_inv_metric = default_metric;
   std::vector<double> dense_vals = inv_inv_metric.vals_r("inv_metric");
   EXPECT_EQ(100, dense_vals.size());