diff --git a/plugins/Moobot.py b/plugins/Moobot.py
index 1b7c70230..79c127519 100644
--- a/plugins/Moobot.py
+++ b/plugins/Moobot.py
@@ -162,7 +162,7 @@ class Moobot(callbacks.Privmsg):
         """
         text = privmsgs.getArgs(args)
         s = base64.encodestring(text).strip()
-        if ircutils.validArgument(s):
+        if ircutils.isValidArgument(s):
             irc.reply(msg, s)
         else:
             irc.error(msg, 'Base64 requires a newline in that string. '\
@@ -176,7 +176,7 @@ class Moobot(callbacks.Privmsg):
         """
         text = privmsgs.getArgs(args)
         s = base64.decodestring(text)
-        if ircutils.validArgument(s):
+        if ircutils.isValidArgument(s):
             irc.reply(msg, s)
         else:
             irc.error(msg, 'I can\'t send \\n, \\r, or \\0.')
diff --git a/src/ircutils.py b/src/ircutils.py
index ae31d4d34..1efc50dee 100644
--- a/src/ircutils.py
+++ b/src/ircutils.py
@@ -157,12 +157,12 @@ def separateModes(args):
 def bold(s):
     return "\x02%s\x02" % s
 
-def validArgument(s):
+def isValidArgument(s):
     return '\r' not in s and '\n' not in s and '\x00' not in s
 
 notFunky = string.printable+'\x02'
 def safeArgument(s):
-    if validArgument(s) and s.translate(string.ascii, notFunky) == '':
+    if isValidArgument(s) and s.translate(string.ascii, notFunky) == '':
         return s
     else:
         return repr(s)