diff --git a/src/frontend/main.go b/src/frontend/main.go
index a9f4f90..a266139 100644
--- a/src/frontend/main.go
+++ b/src/frontend/main.go
@@ -20,6 +20,7 @@ import (
 
 const (
 	port            = "8080"
+	secondaryPort   = "8090" // TODO(ahmetb) remove this, currently used by health checks in Istio mTLS case.
 	defaultCurrency = "USD"
 	cookieMaxAge    = 60 * 60 * 48
 
@@ -107,6 +108,7 @@ func main() {
 		Propagation: &b3.HTTPFormat{}}
 
 	log.Infof("starting server on " + addr + ":" + srvPort)
+	go log.Fatal(http.ListenAndServe(addr+":"+secondaryPort, handler))
 	log.Fatal(http.ListenAndServe(addr+":"+srvPort, handler))
 }