diff --git a/pytplot/tplot_math/tdpwrspc.py b/pytplot/tplot_math/tdpwrspc.py
index c1f55b8f..0bf20b9d 100644
--- a/pytplot/tplot_math/tdpwrspc.py
+++ b/pytplot/tplot_math/tdpwrspc.py
@@ -11,7 +11,8 @@
 import logging
 import numpy as np
 from .dpwrspc import dpwrspc
-from pytplot import get_data, store_data, options, split_vec, time_double
+from .split_vec import split_vec
+from pytplot import get_data, store_data, options, time_double
 
 
 def tdpwrspc(