diff --git a/cmd/derper/bootstrap_dns.go b/cmd/derper/bootstrap_dns.go
index 8c6b9cfed..c657b3591 100644
--- a/cmd/derper/bootstrap_dns.go
+++ b/cmd/derper/bootstrap_dns.go
@@ -57,7 +57,6 @@ func refreshBootstrapDNS() {
 
 func handleBootstrapDNS(w http.ResponseWriter, r *http.Request) {
 	bootstrapDNSRequests.Add(1)
-	w.Header().Set("Content-Type", "application/json")
 	j, _ := dnsCache.Load().([]byte)
 	w.Write(j)
 }