diff --git a/Nextion.cpp b/Nextion.cpp
index 3a36803..7fdc72d 100644
--- a/Nextion.cpp
+++ b/Nextion.cpp
@@ -23,6 +23,7 @@
 #include <cassert>
 #include <cstring>
 #include <ctime>
+#include <clocale>
 
 CNextion::CNextion(const std::string& callsign, unsigned int dmrid, const std::string& port, unsigned int brightness, bool displayClock, bool utc, unsigned int idleBrightness) :
 CDisplay(),