diff --git a/gliderpy/plotting.py b/gliderpy/plotting.py
index 4ab7a02..be0e8a0 100644
--- a/gliderpy/plotting.py
+++ b/gliderpy/plotting.py
@@ -118,7 +118,7 @@ def plot_ctd(
         ax.set_ylabel("Pressure")
         ax.set_xlabel(var)
         ax.invert_yaxis()
-        ax.legend(loc='lower center', bbox_to_anchor=(0.5, 0.09)
+        ax.legend(loc="lower center", bbox_to_anchor=(0.5, 0.09)
 )
         return fig, ax
 
diff --git a/tests/baseline/test_plot_ctd.png b/tests/baseline/test_plot_ctd.png
index d7ff539..b70dac9 100644
Binary files a/tests/baseline/test_plot_ctd.png and b/tests/baseline/test_plot_ctd.png differ