diff --git a/include/util/json_renderer.hpp b/include/util/json_renderer.hpp
index 00d17ac66..ee7c59fbf 100644
--- a/include/util/json_renderer.hpp
+++ b/include/util/json_renderer.hpp
@@ -88,7 +88,7 @@ template <typename Out> struct Renderer
         {
             write('\"');
             write(it->first);
-            write("\"");
+            write("\":");
             mapbox::util::apply_visitor(Renderer(out), it->second);
             if (++it != end)
             {