diff --git a/include/openmc/cell.h b/include/openmc/cell.h
index 0b13eef574..b941acd7f6 100644
--- a/include/openmc/cell.h
+++ b/include/openmc/cell.h
@@ -113,7 +113,6 @@ public:
   explicit Cell(pugi::xml_node cell_node);
   Cell() {};
 
-
   //! \brief Determine if a cell contains the particle at a given location.
   //!
   //! The bounds of the cell are detemined by a logical expression involving
@@ -144,6 +143,7 @@ public:
   //! @param group_id An HDF5 group id.
   virtual void to_hdf5(hid_t group_id) const = 0;
 
+  virtual ~Cell() {}
 };
  
 class CSGCell : public Cell
@@ -162,6 +162,8 @@ public:
 
   void to_hdf5(hid_t group_id) const;
 
+
+  
 protected:
   bool contains_simple(Position r, Direction u, int32_t on_surface) const;
   bool contains_complex(Position r, Direction u, int32_t on_surface) const;
@@ -172,7 +174,7 @@ class DAGCell : public Cell
 {
  public:
   moab::DagMC *dagmc_ptr_;
-  explicit DAGCell();
+  DAGCell();
 
   std::pair<double, int32_t> distance(Position p, Direction u, int32_t on_surface) const;
   bool contains(Position p, Direction u, int32_t on_surface) const;
diff --git a/include/openmc/surface.h b/include/openmc/surface.h
index 9c3df89808..3f2b4d14b5 100644
--- a/include/openmc/surface.h
+++ b/include/openmc/surface.h
@@ -76,7 +76,7 @@ public:
   std::vector<int> neighbor_neg_; //!< List of cells on negative side
 
   explicit Surface(pugi::xml_node surf_node);
-  explicit Surface();
+  Surface();
   
   virtual ~Surface() {}
 
@@ -124,7 +124,7 @@ class CSGSurface : public Surface
 {
  public:
   explicit CSGSurface(pugi::xml_node surf_node);
-  explicit CSGSurface();
+  CSGSurface();
 
   void to_hdf5(hid_t group_id) const;
   
@@ -140,7 +140,7 @@ class DAGSurface : public Surface
 {
  public:
   moab::DagMC* dagmc_ptr_;
-  explicit DAGSurface();
+  DAGSurface();
   double evaluate(Position p) const;
   double distance(Position p, Direction u,
                   bool coincident) const;