diff --git a/pylsp/workspace.py b/pylsp/workspace.py
index d8f1bfd6..846527f6 100644
--- a/pylsp/workspace.py
+++ b/pylsp/workspace.py
@@ -599,9 +599,9 @@ def sys_path(
         )
         path.extend(environment.get_sys_path())
         if prioritize_extra_paths:
-            path += extra_paths + path
+            path = extra_paths + path
         else:
-            path += path + extra_paths
+            path = path + extra_paths
 
         return path