diff --git a/src/core/worker.js b/src/core/worker.js
index 9ae394881..14ac279bf 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -637,7 +637,7 @@ class WorkerMessageHandler {
             if (xfaDatasets === null) {
               xfaDatasets = xref.getNewRef();
             }
-          } else {
+          } else if (xfa) {
             acroFormRef = null;
             // TODO: Support XFA streams.
             warn("Unsupported XFA type.");