diff --git a/tests/include/test/ssl_helpers.h b/tests/include/test/ssl_helpers.h
index 9493b69..f214ce0 100644
--- a/tests/include/test/ssl_helpers.h
+++ b/tests/include/test/ssl_helpers.h
@@ -193,7 +193,12 @@
 
 #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */
 
-int rng_get(void *p_rng, unsigned char *output, size_t output_len);
+/*
+ * Random number generator aimed for TLS unitary tests. Its main purpose is to
+ * simplify the set-up of a random number generator for TLS
+ * unitary tests: no need to set up a good entropy source for example.
+ */
+int mbedtls_test_random(void *p_rng, unsigned char *output, size_t output_len);
 
 /*
  * This function can be passed to mbedtls to receive output logs from it. In