diff --git a/src/serial_AT.cpp b/src/serial_AT.cpp
index 3248d92..f6943bd 100644
--- a/src/serial_AT.cpp
+++ b/src/serial_AT.cpp
@@ -7,6 +7,7 @@
 #include <sstream>
 #include <thread>
 
+#include "app_config.hpp"
 #include "httplib.h"
 #include "logger.hpp"
 #include "nlohmann/json.hpp"