diff --git a/tests/suites/test_suite_tinycrypt.function b/tests/suites/test_suite_tinycrypt.function
index 36e4c66..2cf6566 100644
--- a/tests/suites/test_suite_tinycrypt.function
+++ b/tests/suites/test_suite_tinycrypt.function
@@ -54,16 +54,12 @@
     uint8_t public[2*NUM_ECC_BYTES] = {0};
     uint8_t hash[NUM_ECC_BYTES] = {0};
     uint8_t sig[2*NUM_ECC_BYTES] = {0};
-    unsigned int hash_words[NUM_ECC_WORDS] = {0};
 
     const struct uECC_Curve_t * curve = uECC_secp256r1();
 
     uECC_set_rng( &uecc_rng_wrapper );
 
-    uECC_generate_random_int( hash_words, curve->n,
-                              BITS_TO_WORDS( curve->num_n_bits ) );
-
-    uECC_vli_nativeToBytes( hash, NUM_ECC_BYTES, hash_words );
+    TEST_ASSERT( rnd_std_rand( NULL, hash, NUM_ECC_BYTES ) == 0 );
 
     TEST_ASSERT( uECC_make_key( public, private, curve ) != 0 );