diff --git a/radio/src/targets/simu/simulcd.cpp b/radio/src/targets/simu/simulcd.cpp
index a6ba55205..0620565b9 100644
--- a/radio/src/targets/simu/simulcd.cpp
+++ b/radio/src/targets/simu/simulcd.cpp
@@ -20,6 +20,7 @@
 
 #include "lcd.h"
 #include "simulcd.h"
+#include <string.h>
 #include <utility>
 
 pixel_t simuLcdBuf[DISPLAY_BUFFER_SIZE];