diff --git a/deps/mbedtls/asn1parse.c b/deps/mbedtls/asn1parse.c
index 4dd65c03c0..0e5b28eac0 100644
--- a/deps/mbedtls/asn1parse.c
+++ b/deps/mbedtls/asn1parse.c
@@ -43,10 +43,7 @@
 #define mbedtls_free       free
 #endif
 
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
-    volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
-}
+#include "arc4_alt.h"
 
 /*
  * ASN.1 DER decoding routines