diff --git a/python/_cosmotool.pyx b/python/_cosmotool.pyx
index 4da8716..0f71252 100644
--- a/python/_cosmotool.pyx
+++ b/python/_cosmotool.pyx
@@ -301,7 +301,7 @@ It loads a gadget-1 snapshot and return a PySimulationBase object. If cpu_id is
 
   return _PySimulationAdaptor(wrap_simudata(data, flags))
 
-def loadParallelGadget(list filename_list, bool loadPosition = True, bool loadVelocity = False, bool loadId = False, bool loadType = False, bool loadMass=False):
+def loadParallelGadget(object filename_list, bool loadPosition = True, bool loadVelocity = False, bool loadId = False, bool loadType = False, bool loadMass=False):
   cdef int flags, i, num_files
   cdef list out_arrays
   cdef SimuData ** data