diff --git a/include/openmc/mesh.h b/include/openmc/mesh.h
index e6f5ce98b..ea6b01aa6 100644
--- a/include/openmc/mesh.h
+++ b/include/openmc/mesh.h
@@ -359,7 +359,7 @@ public:
   void to_hdf5(hid_t group) const override;
 
   array<vector<double>, 3> grid_;
-  array<double, 3> centre_;
+  vector<double> centre_;
 
 
   int set_grid();
@@ -415,7 +415,7 @@ public:
   void to_hdf5(hid_t group) const override;
 
   array<vector<double>, 3> grid_;
-  array<double, 3> centre_;
+  vector<double> centre_;
 
   int set_grid();