diff --git a/glances/outputs/glances_curses.py b/glances/outputs/glances_curses.py
index 134952c2..3d1a4fb0 100644
--- a/glances/outputs/glances_curses.py
+++ b/glances/outputs/glances_curses.py
@@ -793,7 +793,7 @@ class _GlancesCurses(object):
                 try:
                     # Python 2: we need to decode to get real screen size because utf-8 special tree chars
                     # occupy several bytes
-                    offset = len(m['msg'].decode("utf-8"))
+                    offset = len(m['msg'].decode("utf-8", "replace"))
                 except AttributeError:
                     # Python 3: strings are strings and bytes are bytes, all is
                     # good