diff --git a/library/ecp.c b/library/ecp.c
index 298c964..26ce962 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -57,6 +57,7 @@
 #include "polarssl/platform.h"
 #else
 #include <stdlib.h>
+#include <stdio.h>
 #define polarssl_printf     printf
 #define polarssl_malloc     malloc
 #define polarssl_free       free