diff --git a/psyneulink/library/compositions/autodiffcomposition.py b/psyneulink/library/compositions/autodiffcomposition.py
index 9dd3ec61d9f..1dfbdce4a33 100644
--- a/psyneulink/library/compositions/autodiffcomposition.py
+++ b/psyneulink/library/compositions/autodiffcomposition.py
@@ -612,9 +612,10 @@ def save(self, path:PosixPath=None, directory:str=None, filename:str=None, conte
                 else:
                     path = Path(os.getcwd())
                 if filename:
-                    path = Path(path / filename)
+                    # path = Path(path / filename)
+                    path = Path(os.path.join(path / filename))
                 else:
-                    path = Path(path / f'{self.name}_matrix_wts.pnl')
+                    path = Path(os.path.join(path / f'{self.name}_matrix_wts.pnl'))
             except IsADirectoryError:
                 raise AutodiffCompositionError(f"'{path}' (for saving weight matrices of ({self.name}) "
                                                f"is not a legal path.")
@@ -675,9 +676,11 @@ def load(self, path:PosixPath=None, directory:str=None, filename:str=None, conte
                 else:
                     path = Path(os.getcwd())
                 if filename:
-                    path = Path(path / filename)
+                    # path = Path(path / filename)
+                    path = Path(os.path.join(path / filename))
                 else:
-                    path = Path(path / f'{self.name}_matrix_wts.pnl')
+                    # path = Path(path / f'{self.name}_matrix_wts.pnl')
+                    path = Path(os.path.join(path , f'{self.name}_matrix_wts.pnl'))
             except IsADirectoryError:
                 raise AutodiffCompositionError(f"'{path}' (for saving weight matrices of ({self.name}) "
                                                f"is not a legal path.")