diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 0464e7d..0659111 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -30,6 +30,8 @@
 
 #include "polarssl/ecp.h"
 
+#include <string.h>
+
 #if defined(_MSC_VER) && !defined(inline)
 #define inline _inline
 #else