diff --git a/geomagio/TimeseriesUtility.py b/geomagio/TimeseriesUtility.py
index 230c87b355ceabe883b1dd399657a2769cc5f502..6b77e28886a2966e3b7406d2f66f0e44787d1367 100644
--- a/geomagio/TimeseriesUtility.py
+++ b/geomagio/TimeseriesUtility.py
@@ -50,7 +50,9 @@ def create_empty_trace(
     if delta > 60.0:
         trace_starttime += (delta - 60) / 2
         if trace_starttime > endtime:
-            sys.stderr.write("Starttime greater than endtime, shifting endtime to next sample")
+            sys.stderr.write(
+                "Starttime greater than endtime, shifting endtime to next sample"
+            )
             endtime = trace_starttime + delta
     stats.starttime = trace_starttime
     stats.delta = delta