diff --git a/tests/test_source_file/test_source_file.py b/tests/test_source_file/test_source_file.py
index 9752d89b49..a1b4986e56 100644
--- a/tests/test_source_file/test_source_file.py
+++ b/tests/test_source_file/test_source_file.py
@@ -73,8 +73,7 @@ def test_run2():
     source = glob.glob(pwd + '/source.10.*')
     with open('settings.xml','w') as fh:
         fh.write(settings2.format(source[0].split('.')[2]))
-#   if int(NoseMPI.mpi_np) > 0:
-    if False:
+    if int(NoseMPI.mpi_np) > 0:
         proc = Popen([NoseMPI.mpi_exec, '-np', NoseMPI.mpi_np, openmc_path],
                stderr=STDOUT, stdout=PIPE)
     else: