diff --git a/cq_editor/widgets/debugger.py b/cq_editor/widgets/debugger.py
index b7398fbe..cbecd3a3 100644
--- a/cq_editor/widgets/debugger.py
+++ b/cq_editor/widgets/debugger.py
@@ -178,9 +178,9 @@ def compile_code(self,cq_script):
     def _exec(self, code, locals_dict, globals_dict):
 
         with ExitStack() as stack:
-            p = Path(self.parent().components['editor'].filename).dirname()
+            p = Path(self.parent().components['editor'].filename).abspath().dirname()
             if self.preferences['Add script dir to path'] and p:
-                sys.path.append(p)
+                sys.path.insert(0,p)
                 stack.callback(sys.path.remove, p)
             if self.preferences['Change working dir to script dir'] and p:
                 stack.enter_context(p)
diff --git a/cqgui_env.yml b/cqgui_env.yml
index 917dc819..00908eb7 100644
--- a/cqgui_env.yml
+++ b/cqgui_env.yml
@@ -17,6 +17,7 @@ dependencies:
   - requests
   - nomkl
   - ezdxf
+  - typing_extensions
   - pip
   - pip:
     - "https://github.com/CadQuery/cadquery/archive/master.zip"