diff --git a/pdf/pdf-tests.ts b/pdf/pdf-tests.ts
index 30e5c013bf..d40ffd5787 100644
--- a/pdf/pdf-tests.ts
+++ b/pdf/pdf-tests.ts
@@ -1,4 +1,4 @@
-/// <reference path="PDF.D.TS" />
+/// <reference path="pdf.d.ts" />
 
 var pdf: PDFPageProxy;