diff --git a/src/org/javarosa/xform/parse/FormInstanceParser.java b/src/org/javarosa/xform/parse/FormInstanceParser.java
index 17d216aa9..b709b2b41 100644
--- a/src/org/javarosa/xform/parse/FormInstanceParser.java
+++ b/src/org/javarosa/xform/parse/FormInstanceParser.java
@@ -63,7 +63,8 @@ FormInstance parseInstance(Element e, boolean isMainInstance, String name, Map<S
         FormInstance instanceModel = new FormInstance(root);
         instanceModel.setName(isMainInstance ? formDef.getTitle() : name);
 
-        final List<String> usedAtts = Collections.unmodifiableList(Arrays.asList("id", "version", "uiVersion", "name"));
+        final List<String> usedAtts = Collections.unmodifiableList(Arrays.asList("id", "version", "uiVersion", "name",
+                "prefix", "delimiter"));
 
         String schema = e.getNamespace();
         if (schema != null && schema.length() > 0 && !schema.equals(defaultNamespace)) {