Fix duplicate symbols problem when using the library from multiple modules.

1 files changed, 1 insertions, 1 deletions

diff --git a/cells.hpp b/cells.hpp
index 27b3633..c53cc93 100644
--- a/cells.hpp
+++ b/cells.hpp
@@ -79,7 +79,7 @@ namespace cells {
     virtual ~formula_cell();
   };
 
-  void with_transaction(std::function<void ()>);
+  static void with_transaction(std::function<void ()>);
 }
 
 #endif //CELLS_HPP