diff --git a/platform/default/src/mbgl/storage/pmtiles_file_source.cpp b/platform/default/src/mbgl/storage/pmtiles_file_source.cpp
index daa9e8ba2..563cb088e 100644
--- a/platform/default/src/mbgl/storage/pmtiles_file_source.cpp
+++ b/platform/default/src/mbgl/storage/pmtiles_file_source.cpp
@@ -291,9 +291,11 @@ private:
                 doc.AddMember("tilejson", "3.0.0", allocator);
 
                 if (!doc.HasMember("scheme")) {
-                    doc.AddMember("scheme", rapidjson::Value().SetString("xyz"), allocator);
+                    doc.AddMember("scheme", rapidjson::Value(), allocator);
                 }
 
+                doc["scheme"] = rapidjson::Value().SetString("xyz");
+
                 if (!doc.HasMember("tiles")) {
                     doc.AddMember("tiles", rapidjson::Value(), allocator);
                 }