diff --git a/fpdfsdk/include/pdfwindow/PWL_SpecialButton.h b/fpdfsdk/include/pdfwindow/PWL_SpecialButton.h
index 9b4ffd2..f6659df 100644
--- a/fpdfsdk/include/pdfwindow/PWL_SpecialButton.h
+++ b/fpdfsdk/include/pdfwindow/PWL_SpecialButton.h
@@ -1,7 +1,7 @@
 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
- 
+
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef FPDFSDK_INCLUDE_PDFWINDOW_PWL_SPECIALBUTTON_H_