diff --git a/.gitignore b/.gitignore
index 2ca1c7d145..b1cb1a623e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,6 +50,7 @@ tests/ctestscript.run
 
 # HDF5 files
 *.h5
+!tests/1d_mgxs.h5
 
 # Build files
 src/CMakeCache.txt
diff --git a/tests/1d_mgxs.h5 b/tests/1d_mgxs.h5
new file mode 100644
index 0000000000..4b7b94cb45
Binary files /dev/null and b/tests/1d_mgxs.h5 differ
diff --git a/tests/run_tests.py b/tests/run_tests.py
index 87282055c2..28bedab0dc 100755
--- a/tests/run_tests.py
+++ b/tests/run_tests.py
@@ -117,7 +117,7 @@ def cleanup(path):
     for dirpath, dirnames, filenames in os.walk(path):
         for fname in filenames:
             for ext in ['.h5', '.ppm', '.voxel']:
-                if fname.endswith(ext):
+                if fname.endswith(ext) and fname != '1d_mgxs.h5':
                     os.remove(os.path.join(dirpath, fname))
 
 
diff --git a/tests/test_mgxs_library_ce_to_mg/test_mgxs_library_ce_to_mg.py b/tests/test_mgxs_library_ce_to_mg/test_mgxs_library_ce_to_mg.py
index a86f73796d..eee528e88e 100644
--- a/tests/test_mgxs_library_ce_to_mg/test_mgxs_library_ce_to_mg.py
+++ b/tests/test_mgxs_library_ce_to_mg/test_mgxs_library_ce_to_mg.py
@@ -83,7 +83,6 @@ class MGXSTestHarness(PyAPITestHarness):
             returncode = openmc.run(openmc_exec=self._opts.exe)
 
     def _cleanup(self):
-        return
         super(MGXSTestHarness, self)._cleanup()
         f = os.path.join(os.getcwd(), 'mgxs.h5')
         if os.path.exists(f):