diff --git a/CHANGES b/CHANGES
index 7d9c67b2a..7ab5186a6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6,6 +6,7 @@ Here you can find the recent changes to libtmux
 
 current
 -------
+- :issue:`289`: Fix warning due to invalid escape sequences
 - :issue:`295`: Publish docs via our own action
 - :issue:`295`: Move more packaging over to poetry, though we'll keep
   setup.py for the moment to ensure compatibility package maintainers.
diff --git a/libtmux/common.py b/libtmux/common.py
index 65f9edcfc..6337913b0 100644
--- a/libtmux/common.py
+++ b/libtmux/common.py
@@ -233,7 +233,7 @@ def __init__(self, *args, **kwargs):
 
 class TmuxMappingObject(MutableMapping):
 
-    """Base: :py:class:`MutableMapping`.
+    r"""Base: :py:class:`MutableMapping`.
 
     Convenience container. Base class for :class:`Pane`, :class:`Window`,
     :class:`Session` and :class:`Server`.
diff --git a/libtmux/pane.py b/libtmux/pane.py
index c42b2def4..5ea1f11f9 100644
--- a/libtmux/pane.py
+++ b/libtmux/pane.py
@@ -153,7 +153,7 @@ def clear(self):
     def reset(self):
         """Reset and clear pane history. """
 
-        self.cmd('send-keys', '-R \; clear-history')
+        self.cmd('send-keys', r'-R \; clear-history')
 
     def split_window(self, attach=False, vertical=True, start_directory=None):
         """