diff --git a/pyhdx/batch_processing.py b/pyhdx/batch_processing.py
index 41257948..650a337f 100644
--- a/pyhdx/batch_processing.py
+++ b/pyhdx/batch_processing.py
@@ -52,7 +52,7 @@ def load_data(self, *filenames: os.PathLike, reader='dynamx') -> pd.DataFrame:
             input_files = [self.data_src / filename for filename in filenames]
             df = read_func(*input_files)
         else:
-            input_stringios = [self.data_src[filename] for filename in filenames]
+            input_stringios = [self.data_src[Path(filename).name] for filename in filenames]
             df = read_func(*input_stringios)
             for io in input_stringios:
                 io.seek(0)