diff --git a/radio/src/thirdparty/libopenui/src/libopenui_file.h b/radio/src/thirdparty/libopenui/src/libopenui_file.h
index 0eace86a0..ee4d49c32 100644
--- a/radio/src/thirdparty/libopenui/src/libopenui_file.h
+++ b/radio/src/thirdparty/libopenui/src/libopenui_file.h
@@ -21,6 +21,7 @@
 #define _LIBOPEUI_FILE_H_
 
 #include <string>
+#include <string.h>
 #include <inttypes.h>
 #include "ff.h"