diff --git a/toarstats/trends/utils.py b/toarstats/trends/utils.py
index 5f18082e173f88bf0416872752d2b67cc2f5be13..aaa024610ec95a7dd2cbe983bdd823daea717343 100644
--- a/toarstats/trends/utils.py
+++ b/toarstats/trends/utils.py
@@ -4,6 +4,8 @@ This module contains the following function:
 deseasonalize - calculate the trend using the requested method
 """
 
+import numpy as np
+import pandas as pd
 import statsmodels.formula.api as smf