diff --git a/bfps/FluidConvert.py b/bfps/FluidConvert.py
index 9a06f2e9dfdb80a21bb86a0f08db508567862a06..2ed34a516c61bcf2fbaaad1c0ec36a720660daeb 100644
--- a/bfps/FluidConvert.py
+++ b/bfps/FluidConvert.py
@@ -28,6 +28,7 @@ import numpy as np
 import pickle
 import os
 from ._fluid_base import _fluid_particle_base
+import bfps
 
 class FluidConvert(_fluid_particle_base):
     """This class is meant to be used for conversion of native DNS field