diff --git a/Sources/AsyncHTTPClient/RequestBag+Tracing.swift b/Sources/AsyncHTTPClient/RequestBag+Tracing.swift
index 729b6256a..5551459d1 100644
--- a/Sources/AsyncHTTPClient/RequestBag+Tracing.swift
+++ b/Sources/AsyncHTTPClient/RequestBag+Tracing.swift
@@ -22,7 +22,7 @@ import Tracing
 extension RequestBag.LoopBoundState {
 
     /// Starts the "overall" Span that encompases the beginning of a request until receipt of the head part of the response.
-    mutating func startRequestSpan<T>(tracer: T?) {
+    mutating func startRequestSpan(tracer: (any Sendable)?) {
         guard #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *),
             let tracer = tracer as! (any Tracer)?
         else {