diff --git a/src/IRCServer.py b/src/IRCServer.py
index 6838968e..d94963e5 100644
--- a/src/IRCServer.py
+++ b/src/IRCServer.py
@@ -288,7 +288,7 @@ class Server(IRCObject.Object):
         return bool(self.available_capability(capability))
     def has_capability_str(self, capability: str) -> bool:
         return capability in self.agreed_capabilities
-    def available_capability(self, capability: utils.irc.Capability) -> bool:
+    def available_capability(self, capability: utils.irc.Capability) -> str:
         return capability.available(self.agreed_capabilities)
 
     def waiting_for_capabilities(self) -> bool: