diff --git a/tinycrypt/ecc_dsa.c b/tinycrypt/ecc_dsa.c
index 77e3efe..ca07eb1 100644
--- a/tinycrypt/ecc_dsa.c
+++ b/tinycrypt/ecc_dsa.c
@@ -182,7 +182,7 @@
 		}
 
 		// computing k as modular reduction of _random (see FIPS 186.4 B.5.1):
-		uECC_vli_mmod(k, _random, curve->n, BITS_TO_WORDS(curve->num_n_bits));
+		uECC_vli_mmod(k, _random, curve->n);
 
 		if (uECC_sign_with_k(private_key, message_hash, hash_size, k, signature, 
 		    curve)) {