diff --git a/include/openmc/surface.h b/include/openmc/surface.h
index 3ba147a5f0..784ecbcece 100644
--- a/include/openmc/surface.h
+++ b/include/openmc/surface.h
@@ -94,7 +94,7 @@ public:
   };
 
   int id_;                    //!< Unique ID
-  Bc bc_;                    //!< Boundary condition
+  BoundaryType bc_;                    //!< Boundary condition
   std::string name_;          //!< User-defined name
 
   explicit Surface(pugi::xml_node surf_node);