diff --git a/UI/streaming-helpers.cpp b/UI/streaming-helpers.cpp
index 14219399b..763f9d233 100644
--- a/UI/streaming-helpers.cpp
+++ b/UI/streaming-helpers.cpp
@@ -56,7 +56,7 @@ Json get_services_json()
 	return root;
 }
 
-Json get_service_from_json(Json &root, const char *name)
+Json get_service_from_json(const Json &root, const char *name)
 {
 	auto &services = root["services"].array_items();
 	for (const Json &service : services) {
diff --git a/UI/streaming-helpers.hpp b/UI/streaming-helpers.hpp
index c545c1d11..170ef3282 100644
--- a/UI/streaming-helpers.hpp
+++ b/UI/streaming-helpers.hpp
@@ -8,7 +8,8 @@
 #include <json11.hpp>
 
 extern json11::Json get_services_json();
-extern json11::Json get_service_from_json(json11::Json &root, const char *name);
+extern json11::Json get_service_from_json(const json11::Json &root,
+					  const char *name);
 
 enum class ListOpt : int {
 	ShowAll = 1,