diff --git a/src/pdf.js b/src/pdf.js
index ed8b6c710f95e..d9c4f2f339417 100644
--- a/src/pdf.js
+++ b/src/pdf.js
@@ -31,7 +31,7 @@ exports.PDFJS = pdfjsDisplayGlobal.PDFJS;
 exports.build = pdfjsDisplayAPI.build;
 exports.version = pdfjsDisplayAPI.version;
 exports.getDocument = pdfjsDisplayAPI.getDocument;
-exports.LoobpackPort = pdfjsDisplayAPI.LoopbackPort;
+exports.LoopbackPort = pdfjsDisplayAPI.LoopbackPort;
 exports.PDFDataRangeTransport = pdfjsDisplayAPI.PDFDataRangeTransport;
 exports.PDFWorker = pdfjsDisplayAPI.PDFWorker;
 exports.renderTextLayer = pdfjsDisplayTextLayer.renderTextLayer;