diff --git a/tests/regression_tests/dagmc/external/inputs_true.dat b/tests/regression_tests/dagmc/external/inputs_true.dat
index 2f56410466..dd75bbdbd9 100644
--- a/tests/regression_tests/dagmc/external/inputs_true.dat
+++ b/tests/regression_tests/dagmc/external/inputs_true.dat
@@ -26,6 +26,7 @@
       <parameters>-4 -4 -4 4 4 4</parameters>
     </space>
   </source>
+  <temperature_default>293</temperature_default>
 </settings>
 <?xml version='1.0' encoding='utf-8'?>
 <tallies>
diff --git a/tests/regression_tests/dagmc/external/main.cpp b/tests/regression_tests/dagmc/external/main.cpp
index 87b1fcc8c3..6d9c97f59b 100644
--- a/tests/regression_tests/dagmc/external/main.cpp
+++ b/tests/regression_tests/dagmc/external/main.cpp
@@ -4,6 +4,7 @@
 #include "openmc/error.h"
 #include "openmc/geometry.h"
 #include "openmc/geometry_aux.h"
+#include "openmc/material.h"
 #include "openmc/nuclide.h"
 #include <iostream>
 
@@ -66,6 +67,14 @@ int main(int argc, char* argv[])
   // Finalize cross sections having assigned temperatures
   openmc::finalize_cross_sections();
 
+  // Check that we correctly assigned cell temperatures with non-void fill
+  for (auto& cell_ptr : openmc::model::cells) {
+    if (cell_ptr->material_.front() != openmc::C_NONE &&
+        cell_ptr->temperature() != 300) {
+      fatal_error("Failed to set cell temperature");
+    }
+  }
+
   // Run OpenMC
   openmc_err = openmc_run();
   if (openmc_err)
diff --git a/tests/regression_tests/dagmc/external/test.py b/tests/regression_tests/dagmc/external/test.py
index c31d814408..a9fa9e3eed 100644
--- a/tests/regression_tests/dagmc/external/test.py
+++ b/tests/regression_tests/dagmc/external/test.py
@@ -64,7 +64,7 @@ def cpp_driver(request):
         shutil.rmtree('build')
         os.remove('CMakeLists.txt')
 
-@pytest.fixture    
+@pytest.fixture
 def model():
     model = openmc.model.Model()
 
@@ -76,7 +76,7 @@ def model():
                                   [ 4,  4,  4])
     source = openmc.Source(space=source_box)
     model.settings.source = source
-    #model.settings.dagmc = True
+    model.settings.temperature['default'] = 293
 
     # Geometry
     dag_univ = openmc.DAGMCUniverse("dagmc.h5m")
@@ -103,7 +103,7 @@ def model():
     model.materials = mats
 
     return model
-    
+
 class ExternalDAGMCTest(PyAPITestHarness):
     def __init__(self, executable, statepoint_name, model):
         super().__init__(statepoint_name, model)