diff --git a/pkg/injector/patch.go b/pkg/injector/patch.go
index 9f58e0950c..426a0dcc5c 100644
--- a/pkg/injector/patch.go
+++ b/pkg/injector/patch.go
@@ -45,7 +45,7 @@ func (wh *mutatingWebhook) createPatch(pod *corev1.Pod, req *v1beta1.AdmissionRe
 	}
 
 	// Create volume for envoy TLS secret
-	pod.Spec.Volumes = getVolumeSpec(envoyBootstrapConfigName)
+	pod.Spec.Volumes = append(pod.Spec.Volumes, getVolumeSpec(envoyBootstrapConfigName)...)
 
 	// Add the Init Container
 	initContainer := getInitContainerSpec(constants.InitContainerName, wh.config.InitContainerImage)