diff --git a/public/crtlib.h b/public/crtlib.h
index a6644a12..338598db 100644
--- a/public/crtlib.h
+++ b/public/crtlib.h
@@ -17,6 +17,7 @@ GNU General Public License for more details.
 #define STDLIB_H
 
 #include <stdarg.h>
+#include <string.h>
 #include "build.h"
 
 #ifdef __GNUC__