diff --git a/protocols/hybrid.py b/protocols/hybrid.py
index 829e0fb..e22e85e 100644
--- a/protocols/hybrid.py
+++ b/protocols/hybrid.py
@@ -169,7 +169,7 @@ class HybridProtocol(TS6Protocol):
         """
         # <- :0UY UID dan 1 1451041551 +Facdeiklosuw ~ident localhost 127.0.0.1 0UYAAAAAB * :realname
         nick = args[0]
-        self.checkCollision(nick)
+        self.check_nick_collision(nick)
         ts, modes, ident, host, ip, uid, account, realname = args[2:10]
         if account == '*':
             account = None
diff --git a/protocols/inspircd.py b/protocols/inspircd.py
index f6331e4..2525c56 100644
--- a/protocols/inspircd.py
+++ b/protocols/inspircd.py
@@ -575,7 +575,7 @@ class InspIRCdProtocol(TS6BaseProtocol):
         """Handles incoming UID commands (user introduction)."""
         # :70M UID 70MAAAAAB 1429934638 GL 0::1 hidden-7j810p.9mdf.lrek.0000.0000.IP gl 0::1 1429934638 +Wioswx +ACGKNOQXacfgklnoqvx :realname
         uid, ts, nick, realhost, host, ident, ip = args[0:7]
-        self.checkCollision(nick)
+        self.check_nick_collision(nick)
         realname = args[-1]
         self.irc.users[uid] = userobj = IrcUser(nick, ts, uid, numeric, ident, host, realname, realhost, ip)
 
diff --git a/protocols/ircs2s_common.py b/protocols/ircs2s_common.py
index 378a772..16edb50 100644
--- a/protocols/ircs2s_common.py
+++ b/protocols/ircs2s_common.py
@@ -14,7 +14,7 @@ class IRCS2SProtocol(Protocol):
         self.protocol_caps = {'can-spawn-clients', 'has-ts', 'can-host-relay',
                               'can-track-servers'}
 
-    def checkCollision(self, nick):
+    def check_nick_collision(self, nick):
         """
         Nick collision checker.
         """
diff --git a/protocols/p10.py b/protocols/p10.py
index 4163303..b9139c4 100644
--- a/protocols/p10.py
+++ b/protocols/p10.py
@@ -901,7 +901,7 @@ class P10Protocol(IRCS2SProtocol):
             # <- AB N GL 1 1460673049 ~gl nefarious.midnight.vpn +iw B]AAAB ABAAA :realname
 
             nick = args[0]
-            self.checkCollision(nick)
+            self.check_nick_collision(nick)
             ts, ident, host = args[2:5]
             realhost = host
             ip = args[-3]
diff --git a/protocols/ts6.py b/protocols/ts6.py
index 32fd783..8249e28 100644
--- a/protocols/ts6.py
+++ b/protocols/ts6.py
@@ -499,7 +499,7 @@ class TS6Protocol(TS6BaseProtocol):
         """Handles incoming EUID commands (user introduction)."""
         # <- :42X EUID GL 1 1437505322 +ailoswz ~gl 127.0.0.1 127.0.0.1 42XAAAAAB * * :realname
         nick = args[0]
-        self.checkCollision(nick)
+        self.check_nick_collision(nick)
         ts, modes, ident, host, ip, uid, realhost, accountname, realname = args[2:11]
         if realhost == '*':
             realhost = None
diff --git a/protocols/unreal.py b/protocols/unreal.py
index e576c3d..fbdba61 100644
--- a/protocols/unreal.py
+++ b/protocols/unreal.py
@@ -390,7 +390,7 @@ class UnrealProtocol(TS6BaseProtocol):
         # arguments: nick, hopcount?, ts, ident, real-host, UID, services account (0 if none), modes,
         #            displayed host, cloaked (+x) host, base64-encoded IP, and realname
         nick = args[0]
-        self.checkCollision(nick)
+        self.check_nick_collision(nick)
         ts, ident, realhost, uid, accountname, modestring, host = args[2:9]
 
         if host == '*':