diff --git a/.readthedocs.yml b/.readthedocs.yml
index a91352d4..58505775 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -10,6 +10,9 @@ python:
 submodules:
   include: all
 
+sphinx:
+  configuration: docs/conf.py
+
 build:
   os: ubuntu-22.04
   tools:
diff --git a/jedi/inference/compiled/subprocess/__main__.py b/jedi/inference/compiled/subprocess/__main__.py
index 58ccd2d6..897ebf33 100644
--- a/jedi/inference/compiled/subprocess/__main__.py
+++ b/jedi/inference/compiled/subprocess/__main__.py
@@ -3,10 +3,6 @@ import sys
 from importlib.abc import MetaPathFinder
 from importlib.machinery import PathFinder
 
-# Remove the first entry, because it's simply a directory entry that equals
-# this directory.
-del sys.path[0]
-
 
 def _get_paths():
     # Get the path to jedi.
diff --git a/jedi/inference/imports.py b/jedi/inference/imports.py
index c1a4953f..f7a363c1 100644
--- a/jedi/inference/imports.py
+++ b/jedi/inference/imports.py
@@ -480,7 +480,7 @@ def _load_builtin_module(inference_state, import_names=None, sys_path=None):
     if sys_path is None:
         sys_path = inference_state.get_sys_path()
     if not project._load_unsafe_extensions:
-        safe_paths = project._get_base_sys_path(inference_state)
+        safe_paths = set(project._get_base_sys_path(inference_state))
         sys_path = [p for p in sys_path if p in safe_paths]
 
     dotted_name = '.'.join(import_names)