diff --git a/deps/mbedtls/aes.c b/deps/mbedtls/aes.c
index 58603849cc..d36b231fb4 100644
--- a/deps/mbedtls/aes.c
+++ b/deps/mbedtls/aes.c
@@ -54,10 +54,7 @@
 
 #if !defined(MBEDTLS_AES_ALT)
 
-/* 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"
 
 /*
  * 32-bit integer manipulation macros (little endian)
diff --git a/deps/mbedtls/arc4.c b/deps/mbedtls/arc4.c
index 05b33d3fdb..26954c6f35 100644
--- a/deps/mbedtls/arc4.c
+++ b/deps/mbedtls/arc4.c
@@ -47,10 +47,7 @@
 
 #if !defined(MBEDTLS_ARC4_ALT)
 
-/* 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"
 
 void mbedtls_arc4_init( mbedtls_arc4_context *ctx )
 {
diff --git a/deps/mbedtls/arc4_alt.h b/deps/mbedtls/arc4_alt.h
new file mode 100644
index 0000000000..9c6a49b206
--- /dev/null
+++ b/deps/mbedtls/arc4_alt.h
@@ -0,0 +1,9 @@
+#ifndef _ARC4_ALT_H
+#define _ARC4_ALT_H
+
+/* 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;
+}
+
+#endif