diff --git a/src/context.py b/src/context.py
index f11c09e..5ec7962 100644
--- a/src/context.py
+++ b/src/context.py
@@ -71,11 +71,13 @@ def _send(data, first, sep, client, send_type, name):
             extra, line = line[:length], line[length:]
             client.send("{0} {1} :{2}{3}".format(send_type, name, first, extra))
 
-def lower(nick, *, host=False):
+def lower(nick, *, casemapping=None):
     if nick is None:
         return None
-    if isinstance(nick, IRCContext) or host:
+    if isinstance(nick, IRCContext):
         return nick.lower()
+    if casemapping is None:
+        casemapping = Features["CASEMAPPING"]
 
     mapping = {
         "[": "{",
@@ -84,9 +86,9 @@ def lower(nick, *, host=False):
         "^": "~",
     }
 
-    if Features["CASEMAPPING"] == "strict-rfc1459":
+    if casemapping == "strict-rfc1459":
         mapping.pop("^")
-    elif Features["CASEMAPPING"] == "ascii":
+    elif casemapping == "ascii":
         mapping.clear()
 
     return nick.lower().translate(str.maketrans(mapping))
diff --git a/src/users.py b/src/users.py
index d6bb71f..ba4fa68 100644
--- a/src/users.py
+++ b/src/users.py
@@ -279,7 +279,7 @@ class User(IRCContext):
         return self._compare(other, __class__, "nick", "ident", "host", "realname", "account")
 
     def lower(self):
-        temp = type(self)(self.client, lower(self.nick), lower(self.ident), lower(self.host, host=True), lower(self.realname), lower(self.account))
+        temp = type(self)(self.client, lower(self.nick), lower(self.ident), lower(self.host, casemapping="ascii"), lower(self.realname), lower(self.account))
         if temp is not self: # If everything is already lowercase, we'll get back the same instance
             temp.channels = self.channels
             temp.ref = self.ref or self
@@ -573,7 +573,7 @@ class BotUser(User): # TODO: change all the 'if x is Bot' for 'if isinstance(x,
         temp = type(self)(self.client, lower(self.nick))
         if temp is not self:
             temp.ident = lower(self.ident)
-            temp.host = lower(self.host, host=True)
+            temp.host = lower(self.host, casemapping="ascii")
             temp.realname = lower(self.realname)
             temp.account = lower(self.account)
             temp.modes = self.modes