diff --git a/ndbioimage/__init__.py b/ndbioimage/__init__.py
index c4b1247..3d425d3 100755
--- a/ndbioimage/__init__.py
+++ b/ndbioimage/__init__.py
@@ -913,7 +913,7 @@ class Imread(np.lib.mixins.NDArrayOperatorsMixin, ABC):
     def split_path_series(path):
         if isinstance(path, str):
             path = Path(path)
-        if isinstance(path, Path) and path.name.startswith('Pos'):
+        if isinstance(path, Path) and path.name.startswith('Pos') and path.name.lstrip('Pos').isdigit():
             return path.parent, int(path.name.lstrip('Pos'))
         return path, 0
 
diff --git a/pyproject.toml b/pyproject.toml
index e7b64bf..623abdf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ndbioimage"
-version = "2024.3.4"
+version = "2024.3.5"
 description = "Bio image reading, metadata and some affine registration."
 authors = ["W. Pomp <w.pomp@nki.nl>"]
 license = "GPLv3"