diff --git a/src/storage/SimpleResourceStore.ts b/src/storage/SimpleResourceStore.ts
index 5ba58c7c6..b7fa1d0e4 100644
--- a/src/storage/SimpleResourceStore.ts
+++ b/src/storage/SimpleResourceStore.ts
@@ -27,7 +27,7 @@ export class SimpleResourceStore implements ResourceStore {
       '': {
         dataType: DATA_TYPE_BINARY,
         data: streamifyArray([]),
-        metadata: { raw: [], profiles: []},
+        metadata: { raw: [], profiles: [], contentType: 'text/turtle' },
       },
     };
   }