diff --git a/CHANGELOG.md b/CHANGELOG.md
index fde0075..e86a3c4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -45,6 +45,7 @@
 ### Fixed
 
 1. console-server: Fix configuration of lpc_address and sirq sysfs attributes
+2. config.h: Include stddef.h for size_t
 
 ## [1.1.0] - 2023-06-07
 
diff --git a/config.h b/config.h
index 0a8a4cd..918ecc9 100644
--- a/config.h
+++ b/config.h
@@ -17,6 +17,7 @@
 
 #pragma once
 
+#include <stddef.h>
 #include <stdint.h>
 #include <termios.h>