diff --git a/third_party/microtbx-modbus b/third_party/microtbx-modbus
index 9b5fd3b..afbac8b 160000
--- a/third_party/microtbx-modbus
+++ b/third_party/microtbx-modbus
@@ -1 +1 @@
-Subproject commit 9b5fd3b83fb288ac94b70ff2edc9f2dc41a1ecee
+Subproject commit afbac8b808cbff6ae3299cbd3cbd70aef829094b