diff --git a/pyposeidon/schism.py b/pyposeidon/schism.py
index 37739ac1..19dfd420 100644
--- a/pyposeidon/schism.py
+++ b/pyposeidon/schism.py
@@ -1518,7 +1518,7 @@ def results(self, **kwargs):
             date.columns = ["year", "month", "day", "hour", "utc"]  # rename the columns
             logger.debug(date.head())
             logger.debug(date.columns)
-            logger.debug(date['utc'].unique())
+            logger.debug(date["utc"].unique())
             # set the start timestamp
             logger.debug(date.year.values[0], type(date.year.values[0]))
             logger.debug(date.month.values[0], type(date.month.values[0]))