diff --git a/readme.md b/readme.md
index a57de33..ed9cfb5 100644
--- a/readme.md
+++ b/readme.md
@@ -36,6 +36,9 @@ This code will be executed
 ```
 
 # Changelog
+#### 0.18 (2026-03-18)
+- Fixed warning
+
 #### 0.17 (2026-03-18)
 - Dropped support for Python 3.8
 - Added some type hints and updated dependencies
diff --git a/src/sphinx_exec_code/__version__.py b/src/sphinx_exec_code/__version__.py
index 9446169..dfd0f8a 100644
--- a/src/sphinx_exec_code/__version__.py
+++ b/src/sphinx_exec_code/__version__.py
@@ -1 +1 @@
-__version__ = '0.17'
+__version__ = '0.18'
diff --git a/src/sphinx_exec_code/configuration/base.py b/src/sphinx_exec_code/configuration/base.py
index 5d38f2b..86bad74 100644
--- a/src/sphinx_exec_code/configuration/base.py
+++ b/src/sphinx_exec_code/configuration/base.py
@@ -15,7 +15,7 @@
 
 
 class SphinxConfigValue(Generic[TYPE_VALUE]):
-    SPHINX_TYPE: tuple[type[Any], ...] | type[Any] | tuple[()]
+    SPHINX_TYPE: tuple[type[Any], ...] | type[Any]
 
     def __init__(self, sphinx_name: str, initial_value: TYPE_VALUE | None = None) -> None:
         self.sphinx_name: Final = sphinx_name
diff --git a/src/sphinx_exec_code/configuration/path_config.py b/src/sphinx_exec_code/configuration/path_config.py
index 1835080..c162138 100644
--- a/src/sphinx_exec_code/configuration/path_config.py
+++ b/src/sphinx_exec_code/configuration/path_config.py
@@ -51,7 +51,7 @@ def validate_value(self, value: Path) -> Path:
 
 
 class SphinxConfigMultipleFolderStr(_SphinxConfigPathBase[tuple[str, ...]]):
-    SPHINX_TYPE = ()
+    SPHINX_TYPE = (tuple, list)
 
     @override
     def transform_value(self, app: SphinxApp, value: Any) -> tuple[str, ...]: