diff --git a/lmcp.lua b/lmcp.lua
index 772687c..df3875d 100644
--- a/lmcp.lua
+++ b/lmcp.lua
@@ -939,7 +939,7 @@ local function _check_auth(self, conn)
     if not self._auth_token then return true end
     if conn.method == "OPTIONS" then return true end
     local auth = conn.headers["authorization"] or ""
-    local token = auth:match("^Bearer%s+(.+)$")
+    local token = auth:match("^[Bb]earer%s+(.+)$")
     return token == self._auth_token
 end