diff --git a/runtimes/google/ipc/stream/manager/http.go b/runtimes/google/ipc/stream/manager/http.go
index f601a45..c8a485c 100644
--- a/runtimes/google/ipc/stream/manager/http.go
+++ b/runtimes/google/ipc/stream/manager/http.go
@@ -26,6 +26,6 @@
 type httpHandler struct{ m *manager }
 
 func (h httpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "text/plain")
+	w.Header().Set("Content-Type", "text/plain; charset=UTF-8")
 	w.Write([]byte(h.m.DebugString()))
 }