diff --git a/mlair/plotting/postprocessing_plotting.py b/mlair/plotting/postprocessing_plotting.py
index caefbd82193b2202edb9e15d13ab34eeb143a97c..f0b6baeb0b56126ccccb80c9da993fb406428d93 100644
--- a/mlair/plotting/postprocessing_plotting.py
+++ b/mlair/plotting/postprocessing_plotting.py
@@ -838,8 +838,8 @@ class PlotTimeSeries:
         factor = 1
         if self._sampling == "h":
             factor = 2
-        f, ax = plt.subplots((end - start + 1) * factor, sharey=True, figsize=(50, 30))
-        return f, ax, factor
+        f, ax = plt.subplots((end - start + 1) * factor, sharey=True, figsize=(50, 30), squeeze=False)
+        return f, ax[:, 0], factor
 
     def _plot_ahead(self, ax, data):
         color = sns.color_palette("Blues_d", self._window_lead_time).as_hex()