diff --git a/tinycrypt/ecc_dh.c b/tinycrypt/ecc_dh.c
index 52208ad..71c51f5 100644
--- a/tinycrypt/ecc_dh.c
+++ b/tinycrypt/ecc_dh.c
@@ -123,7 +123,7 @@
 		}
 
 		/* computing modular reduction of _random (see FIPS 186.4 B.4.1): */
-		uECC_vli_mmod(_private, _random, curve->n, BITS_TO_WORDS(curve->num_n_bits));
+		uECC_vli_mmod(_private, _random, curve->n);
 
 		/* Computing public-key from private: */
 		if (EccPoint_compute_public_key(_public, _private, curve)) {