diff --git a/kmcos/run/__init__.py b/kmcos/run/__init__.py
index 630e34f439fb683e98a7f1383c04a258ec72878a..091d07f5dbf4554b862c382ee60c3e150ba4b7b9 100644
--- a/kmcos/run/__init__.py
+++ b/kmcos/run/__init__.py
@@ -2510,7 +2510,7 @@ and <classname>.lock should be moved out of the way ::
         coverages.
         """
         import matplotlib
-        matplotlib.use(backend, warn=False)
+        matplotlib.use(backend)
         # Suppress backend warning, because we cannot
         # control how often the current method is called from
         # a script and superfluous warning tends to confuse users