diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 738014e..8ab9886 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -48,10 +48,7 @@
 #endif
 
 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
-    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
-}
+#include "mbedtls/utils.h"
 #endif
 
 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)