diff --git a/wuffs-mirror-release-c b/wuffs-mirror-release-c
index 40ff91b..c63c4a9 160000
--- a/wuffs-mirror-release-c
+++ b/wuffs-mirror-release-c
@@ -1 +1 @@
-Subproject commit 40ff91b31b3286aa92fd3cb4656975b275ef8b10
+Subproject commit c63c4a9348fb1b52a9b60a6eb62328a97d979d9e