diff --git a/route/route.go b/route/route.go
index dbec638e5..742e57547 100644
--- a/route/route.go
+++ b/route/route.go
@@ -46,6 +46,10 @@ func (r *Router) WithPrefix(prefix string) *Router {
 
 // handle turns a HandlerFunc into an httprouter.Handle.
 func (r *Router) handle(handlerName string, h http.HandlerFunc) httprouter.Handle {
+	if r.instrh != nil {
+		// This needs to be outside the closure to avoid data race when reading and writing to 'h'.
+		h = r.instrh(handlerName, h)
+	}
 	return func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
 		ctx, cancel := context.WithCancel(req.Context())
 		defer cancel()
@@ -53,9 +57,6 @@ func (r *Router) handle(handlerName string, h http.HandlerFunc) httprouter.Handl
 		for _, p := range params {
 			ctx = context.WithValue(ctx, param(p.Key), p.Value)
 		}
-		if r.instrh != nil {
-			h = r.instrh(handlerName, h)
-		}
 		h(w, req.WithContext(ctx))
 	}
 }