diff --git a/pocketbot.py b/pocketbot.py
index cefbf04..0831e13 100644
--- a/pocketbot.py
+++ b/pocketbot.py
@@ -83,7 +83,7 @@ def on_message(message):
         if (command is '' ):
             helpfile = open(cwd + "/helpcommand.txt","r")
             yield from client.send_message(message.channel, helpfile.read())
-        elif os.path.isfile(cwd + "/helptext/" + command):
+        elif re.match("^[A-Za-z0-9_-]*$", command) and os.path.isfile(cwd + "/helptext/" + command):
             commandhelp = open(cwd + "/helptext/" + command,"r")
             yield from client.send_message(message.channel, commandhelp.read())
         else: