diff --git a/include/openmc/mcpl_interface.h b/include/openmc/mcpl_interface.h
index c931f1774..64f15c13a 100644
--- a/include/openmc/mcpl_interface.h
+++ b/include/openmc/mcpl_interface.h
@@ -2,9 +2,9 @@
 #define OPENMC_MCPL_INTERFACE_H
 
 #include "openmc/particle_data.h"
+#include "openmc/vector.h"
 
 #include <string>
-#include <vector>
 
 namespace openmc {
 
diff --git a/src/mcpl_interface.cpp b/src/mcpl_interface.cpp
index e9bc64830..a38891478 100644
--- a/src/mcpl_interface.cpp
+++ b/src/mcpl_interface.cpp
@@ -6,6 +6,7 @@
 #include "openmc/settings.h"
 #include "openmc/simulation.h"
 #include "openmc/state_point.h"
+#include "openmc/vector.h"
 
 #include <fmt/core.h>
 
@@ -57,9 +58,8 @@ SourceSite mcpl_particle_to_site(const mcpl_particle_t* particle)
   site.u.y = particle->direction[1];
   site.u.z = particle->direction[2];
 
-  // mcpl stores kinetic energy in MeV
+  // MCPL stores kinetic energy in [MeV], time in [ms]
   site.E = particle->ekin * 1e6;
-  // mcpl stores time in ms
   site.time = particle->time * 1e-3;
   site.wgt = particle->weight;
 
@@ -155,29 +155,26 @@ void write_mcpl_source_bank(mcpl_outfile_t file_id, bool surf_source_bank)
           mpi::intracomm, MPI_STATUS_IGNORE);
 #endif
       // now write the source_bank data again.
-      for (vector<SourceSite>::iterator _site = source_bank->begin();
-           _site != source_bank->end(); _site++) {
+      for (const auto& site : *source_bank) {
         // particle is now at the iterator
         // write it to the mcpl-file
         mcpl_particle_t p;
-        p.position[0] = _site->r.x;
-        p.position[1] = _site->r.y;
-        p.position[2] = _site->r.z;
+        p.position[0] = site.r.x;
+        p.position[1] = site.r.y;
+        p.position[2] = site.r.z;
 
         // mcpl requires that the direction vector is unit length
         // which is also the case in openmc
-        p.direction[0] = _site->u.x;
-        p.direction[1] = _site->u.y;
-        p.direction[2] = _site->u.z;
+        p.direction[0] = site.u.x;
+        p.direction[1] = site.u.y;
+        p.direction[2] = site.u.z;
 
-        // mcpl stores kinetic energy in MeV
-        p.ekin = _site->E * 1e-6;
+        // MCPL stores kinetic energy in [MeV], time in [ms]
+        p.ekin = site.E * 1e-6;
+        p.time = site.time * 1e3;
+        p.weight = site.wgt;
 
-        p.time = _site->time * 1e3;
-
-        p.weight = _site->wgt;
-
-        switch (_site->particle) {
+        switch (site.particle) {
         case ParticleType::neutron:
           p.pdgcode = 2112;
           break;
diff --git a/tests/regression_tests/source_mcpl_file/results_true.dat b/tests/regression_tests/source_mcpl_file/results_true.dat
index 5651efde7..0a98e9d8c 100644
--- a/tests/regression_tests/source_mcpl_file/results_true.dat
+++ b/tests/regression_tests/source_mcpl_file/results_true.dat
@@ -1,2 +1,2 @@
 k-combined:
-2.943088E-01 2.093028E-03
+3.009416E-01 3.229999E-03
diff --git a/tests/regression_tests/source_mcpl_file/settings.xml b/tests/regression_tests/source_mcpl_file/settings.xml
index 2e511461f..47b010bff 100644
--- a/tests/regression_tests/source_mcpl_file/settings.xml
+++ b/tests/regression_tests/source_mcpl_file/settings.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0"?>
 <settings>
-  <seed>1234</seed>
   <state_point batches="10" />
   <source_point mcpl="true" separate="true" />
   <eigenvalue>
diff --git a/tests/regression_tests/source_mcpl_file/test.py b/tests/regression_tests/source_mcpl_file/test.py
index 60e0ad50f..84ec005ae 100644
--- a/tests/regression_tests/source_mcpl_file/test.py
+++ b/tests/regression_tests/source_mcpl_file/test.py
@@ -11,7 +11,6 @@ pytestmark = pytest.mark.skipif(
 
 settings1="""<?xml version="1.0"?>
 <settings>
-  <seed>1234</seed>
   <state_point batches="10" />
   <source_point mcpl="true" separate="true" />
   <eigenvalue>
@@ -35,7 +34,7 @@ settings2 = """<?xml version="1.0"?>
     <particles>1000</particles>
   </eigenvalue>
   <source>
-    <filename> source.10.{0} </filename>
+    <file>source.10.{}</file>
   </source>
 </settings>
 """