diff --git a/cowrie/core/shlex.py b/cowrie/core/shlex.py
index a482d21..67b295e 100644
--- a/cowrie/core/shlex.py
+++ b/cowrie/core/shlex.py
@@ -62,7 +62,7 @@ class shlex:
             # _pushback_chars is a push back queue used by lookahead logic
             self._pushback_chars = deque()
             # these chars added because allowed in file names, args, wildcards
-            self.wordchars += '{}~-./*?=$:'
+            self.wordchars += '{}~-./*?=$:+'
             #remove any punctuation chars from wordchars
             self.wordchars = ''.join(c for c in self.wordchars if c not in
                                      self.punctuation_chars)