diff --git a/src/core/worker.js b/src/core/worker.js
index 30effa8a4..d4deb0c8c 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -138,7 +138,7 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
           }
         },
 
-        onProgressiveData: PDFJS.disableStream ? null :
+        onProgressiveData: source.disableStream ? null :
             function onProgressiveData(chunk) {
           if (!pdfManager) {
             cachedChunks.push(chunk);
diff --git a/src/display/api.js b/src/display/api.js
index e400e1d5b..b20472231 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -1076,6 +1076,7 @@ var WorkerTransport = (function WorkerTransportClosure() {
 
     fetchDocument: function WorkerTransport_fetchDocument(source) {
       source.disableAutoFetch = PDFJS.disableAutoFetch;
+      source.disableStream = PDFJS.disableStream;
       source.chunkedViewerLoading = !!this.pdfDataRangeTransport;
       this.messageHandler.send('GetDocRequest', {
         source: source,