diff --git a/binarycpython/utils/grid.py b/binarycpython/utils/grid.py
index edaac0eb36f309f6252d2f50150fe98b7da3b66a..1891df1eb7d57c4b9ed59c5e05985d6ab95316e8 100644
--- a/binarycpython/utils/grid.py
+++ b/binarycpython/utils/grid.py
@@ -1802,7 +1802,7 @@ class Population:
             1,
         )
         # free store memory:
-        binary_c_bindings.free_store_memaddr(self.grid_options["_store_memaddr"])
+        _binary_c_bindings.free_store_memaddr(self.grid_options["_store_memaddr"])
 
         # Return a set of results and errors
         output_dict = {