diff --git a/expat/Changes b/expat/Changes
index 2fdc6a43..0fd4845d 100644
--- a/expat/Changes
+++ b/expat/Changes
@@ -8,11 +8,13 @@ Release 2.??? ????????????????
              #50  Fix too eager getrandom detection for Debian GNU/kFreeBSD
              #52    and macOS
              #51  Address lack of stdint.h in Visual Studio 2003 to 2008
+             #58  Address compile warnings
 
         Special thanks to:
             Cătălin Răceanu
             László Böszörményi
             S. P. Zeidler
+            Victor Stinner
 
 Release 2.2.1 Sat June 17 2017
         Security fixes:
diff --git a/expat/lib/siphash.h b/expat/lib/siphash.h
index e7df3367..1e1813a6 100644
--- a/expat/lib/siphash.h
+++ b/expat/lib/siphash.h
@@ -3,7 +3,7 @@
  * --------------------------------------------------------------------------
  * Derived by William Ahern from the reference implementation[1] published[2]
  * by Jean-Philippe Aumasson and Daniel J. Berstein.
- * Minimal changes by Sebastian Pipping on top, details below.
+ * Minimal changes by Sebastian Pipping and Victor Stinner on top, see below.
  * Licensed under the CC0 Public Domain Dedication license.
  *
  * 1. https://www.131002.net/siphash/siphash24.c
@@ -11,6 +11,9 @@
  * --------------------------------------------------------------------------
  * HISTORY:
  *
+ * 2017-06-23  (Victor Stinner)
+ *   - Address Win64 compile warnings
+ *
  * 2017-06-18  (Sebastian Pipping)
  *   - Address lack of stdint.h for Visual Studio 2003 to 2008
  *