diff --git a/pyfstat/tcw_fstat_map_funcs.py b/pyfstat/tcw_fstat_map_funcs.py
index 4237fa9cfd71031df214b1dd328e9565ca174a74..7d7728a7fd00769de516193309fc97ea69afb9bc 100644
--- a/pyfstat/tcw_fstat_map_funcs.py
+++ b/pyfstat/tcw_fstat_map_funcs.py
@@ -2,7 +2,6 @@
 
 import numpy as np
 import os
-import sys
 import logging
 
 # optional imports