diff --git a/WiringPi b/WiringPi
index e9821ab..4639b7a 160000
--- a/WiringPi
+++ b/WiringPi
@@ -1 +1 @@
-Subproject commit e9821abdb4b4fe46a2ea9243471d339435fa7bde
+Subproject commit 4639b7ac45ff87a9c2271a3d44f7fccb618c88ff