diff --git a/include/tinycrypt/ecc.h b/include/tinycrypt/ecc.h
index e016c696b..d6f2c9dfc 100644
--- a/include/tinycrypt/ecc.h
+++ b/include/tinycrypt/ecc.h
@@ -428,8 +428,7 @@ uECC_word_t uECC_vli_equal(const uECC_word_t *left, const uECC_word_t *right);
  * @param num_words IN -- number of words
  */
 void uECC_vli_modMult(uECC_word_t *result, const uECC_word_t *left,
-		      const uECC_word_t *right, const uECC_word_t *mod,
-	              wordcount_t num_words);
+		      const uECC_word_t *right, const uECC_word_t *mod);
 
 /*
  * @brief Computes (1 / input) % mod
diff --git a/tinycrypt/ecc.c b/tinycrypt/ecc.c
index 508831cb2..81464e1e0 100644
--- a/tinycrypt/ecc.c
+++ b/tinycrypt/ecc.c
@@ -489,13 +489,11 @@ void uECC_vli_mmod(uECC_word_t *result, uECC_word_t *product,
 }
 
 void uECC_vli_modMult(uECC_word_t *result, const uECC_word_t *left,
-		      const uECC_word_t *right, const uECC_word_t *mod,
-		      wordcount_t num_words)
+		      const uECC_word_t *right, const uECC_word_t *mod)
 {
 	uECC_word_t product[2 * NUM_ECC_WORDS];
 	uECC_vli_mult_rnd(product, left, right, NULL);
 	uECC_vli_mmod(result, product, mod);
-	(void) num_words;
 }
 
 static void uECC_vli_modMult_rnd(uECC_word_t *result, const uECC_word_t *left,
diff --git a/tinycrypt/ecc_dsa.c b/tinycrypt/ecc_dsa.c
index ca07eb191..09b2b848e 100644
--- a/tinycrypt/ecc_dsa.c
+++ b/tinycrypt/ecc_dsa.c
@@ -142,9 +142,9 @@ int uECC_sign_with_k(const uint8_t *private_key, const uint8_t *message_hash,
 
 	/* Prevent side channel analysis of uECC_vli_modInv() to determine
 	bits of k / the private key by premultiplying by a random number */
-	uECC_vli_modMult(k, k, tmp, curve->n, num_n_words); /* k' = rand * k */
+	uECC_vli_modMult(k, k, tmp, curve->n); /* k' = rand * k */
 	uECC_vli_modInv(k, k, curve->n, num_n_words);       /* k = 1 / k' */
-	uECC_vli_modMult(k, k, tmp, curve->n, num_n_words); /* k = 1 / k */
+	uECC_vli_modMult(k, k, tmp, curve->n); /* k = 1 / k */
 
 	uECC_vli_nativeToBytes(signature, curve->num_bytes, p); /* store r */
 
@@ -153,11 +153,11 @@ int uECC_sign_with_k(const uint8_t *private_key, const uint8_t *message_hash,
 
 	s[num_n_words - 1] = 0;
 	uECC_vli_set(s, p);
-	uECC_vli_modMult(s, tmp, s, curve->n, num_n_words); /* s = r*d */
+	uECC_vli_modMult(s, tmp, s, curve->n); /* s = r*d */
 
 	bits2int(tmp, message_hash, hash_size, curve);
 	uECC_vli_modAdd(s, tmp, s, curve->n); /* s = e + r*d */
-	uECC_vli_modMult(s, s, k, curve->n, num_n_words);  /* s = (e + r*d) / k */
+	uECC_vli_modMult(s, s, k, curve->n);  /* s = (e + r*d) / k */
 	if (uECC_vli_numBits(s) > (bitcount_t)curve->num_bytes * 8) {
 		return 0;
 	}
@@ -245,8 +245,8 @@ int uECC_verify(const uint8_t *public_key, const uint8_t *message_hash,
 	uECC_vli_modInv(z, s, curve->n, num_n_words); /* z = 1/s */
 	u1[num_n_words - 1] = 0;
 	bits2int(u1, message_hash, hash_size, curve);
-	uECC_vli_modMult(u1, u1, z, curve->n, num_n_words); /* u1 = e/s */
-	uECC_vli_modMult(u2, r, z, curve->n, num_n_words); /* u2 = r/s */
+	uECC_vli_modMult(u1, u1, z, curve->n); /* u1 = e/s */
+	uECC_vli_modMult(u2, r, z, curve->n); /* u2 = r/s */
 
 	/* Calculate sum = G + Q. */
 	uECC_vli_set(sum, _public);