diff --git a/src/sunxi_cedrus.c b/src/sunxi_cedrus.c
index f66100f..7ae8e0d 100644
--- a/src/sunxi_cedrus.c
+++ b/src/sunxi_cedrus.c
@@ -42,6 +42,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+#include <string.h>
 #include <unistd.h>
 #include <stdarg.h>
 #include <fcntl.h>