diff --git a/include/openmc/settings.h b/include/openmc/settings.h
index 8f43767171..45cb7394c8 100644
--- a/include/openmc/settings.h
+++ b/include/openmc/settings.h
@@ -31,7 +31,7 @@ extern "C" bool cmfd_run;             //!< is a CMFD run?
 extern "C" bool dagmc;                //!< indicator of DAGMC geometry
 extern "C" bool entropy_on;           //!< calculate Shannon entropy?
 extern bool legendre_to_tabular;      //!< convert Legendre distributions to tabular?
-extern bool output_summary;           //!< write summary.h5?
+extern "C" bool output_summary;       //!< write summary.h5?
 extern bool output_tallies;           //!< write tallies.out?
 extern bool particle_restart_run;     //!< particle restart run?
 extern "C" bool photon_transport;     //!< photon transport turned on?
diff --git a/openmc/lib/settings.py b/openmc/lib/settings.py
index 78794d8563..275c73a934 100644
--- a/openmc/lib/settings.py
+++ b/openmc/lib/settings.py
@@ -26,6 +26,7 @@ class _Settings(object):
     restart_run = _DLLGlobal(c_bool, 'restart_run')
     run_CE = _DLLGlobal(c_bool, 'run_CE')
     verbosity = _DLLGlobal(c_int, 'verbosity')
+    output_summary = _DLLGlobal(c_bool, 'output_summary')
 
     @property
     def run_mode(self):