diff --git a/postprocessor.py b/postprocessor.py
index e9d5943..0a9211a 100644
--- a/postprocessor.py
+++ b/postprocessor.py
@@ -366,7 +366,7 @@ class PostProcessor(HDF5Container):
         Load data from the source file in the memory.
         (Long and memory heavy)
         """
-        if not self.parts_loaded:
+        if not loaded:
             if os.path.exists(filename):
                 hdf5 = tables.open_file(filename, mode="r")
                 try: