diff --git a/binarycpython/utils/grid.py b/binarycpython/utils/grid.py
index 0ca70117b45ef4360f8322ec3de8c9be3952803e..ac190b9767224408466f38ecb0c6dfe58ea75422 100644
--- a/binarycpython/utils/grid.py
+++ b/binarycpython/utils/grid.py
@@ -1801,7 +1801,7 @@ 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 = {