diff --git a/src/finalize.cpp b/src/finalize.cpp
index b5b23b9d5..ea0470f9b 100644
--- a/src/finalize.cpp
+++ b/src/finalize.cpp
@@ -63,6 +63,9 @@ using namespace openmc;
 
 int openmc_finalize()
 {
+  if (simulation::initialized)
+    openmc_simulation_finalize();
+
   // Clear results
   openmc_reset();