diff --git a/programs/cipher/cipher_aead_demo.c b/programs/cipher/cipher_aead_demo.c
index 853ec20..60a5ea2 100644
--- a/programs/cipher/cipher_aead_demo.c
+++ b/programs/cipher/cipher_aead_demo.c
@@ -35,6 +35,8 @@
 
 #include "mbedtls/cipher.h"
 
+#include <test/helpers.h>
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -78,16 +80,6 @@
  * 32-byte is enough to all the key size supported by this program. */
 const unsigned char key_bytes[32] = { 0x2a };
 
-/* Print the contents of a buffer in hex */
-void print_buf(const char *title, unsigned char *buf, size_t len)
-{
-    printf("%s:", title);
-    for (size_t i = 0; i < len; i++) {
-        printf(" %02x", buf[i]);
-    }
-    printf("\n");
-}
-
 /* Run an Mbed TLS function and bail out if it fails.
  * A string description of the error code can be recovered with:
  * programs/util/strerror <value> */
@@ -198,7 +190,7 @@
     p += tag_len;
 
     olen = p - out;
-    print_buf("out", out, olen);
+    mbedtls_test_print_buf("out", out, olen);
 
 exit:
     return ret;