diff --git a/cmmde_gui/gui.py b/cmmde_gui/gui.py
index e180688..8dbdff2 100755
--- a/cmmde_gui/gui.py
+++ b/cmmde_gui/gui.py
@@ -200,7 +200,7 @@ def cmmde_gui():
         else:
             # Folder = workdir + "/" + id_input.value + "/" + Molecule_input.value 
             # os.chdir(Folder) 
-            Post_folder = Folder + post_calc[post_btn.value] 
+            Post_folder = Folder + "/" + post_calc[post_btn.value] 
             if not os.path.exists(Post_folder):
                 os.makedirs(Post_folder)
             os.chdir(Post_folder)