diff --git a/plotter.py b/plotter.py
index da08c0d..ef28f74 100644
--- a/plotter.py
+++ b/plotter.py
@@ -956,7 +956,7 @@ class Plotter(Aggregator, BaseProcessor):
                 return
         elif parts:
             # Open particle HDF5 filetype_from_ext
-            self.current_processor.load_parts(keys=["pos", "mass"])
+            self.current_processor.load_parts()
             data = self.current_processor.parts
             part_pos = self.current_processor.parts["pos"]
             mass = self.current_processor.parts["mass"]