diff --git a/content/base/src/nsContentAreaDragDrop.cpp b/content/base/src/nsContentAreaDragDrop.cpp
index 71a1cc6f0a0c..7190bb4fd373 100644
--- a/content/base/src/nsContentAreaDragDrop.cpp
+++ b/content/base/src/nsContentAreaDragDrop.cpp
@@ -215,6 +215,8 @@ nsContentAreaDragDropDataProvider::SaveURIToFile(nsAString& inSourceURIString,
                       &rv);
   NS_ENSURE_SUCCESS(rv, rv);
 
+  persist->SetPersistFlags(nsIWebBrowserPersist::PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION);
+
   return persist->SaveURI(sourceURI, nsnull, nsnull, nsnull, nsnull, inDestFile);
 }