diff --git a/include/tinycrypt/ecc.h b/include/tinycrypt/ecc.h
index 1205eb1..59a7a89 100644
--- a/include/tinycrypt/ecc.h
+++ b/include/tinycrypt/ecc.h
@@ -484,7 +484,7 @@
  * @param vli IN -- very long integer
  * @param num_words IN -- number of words
  */
-void uECC_vli_clear(uECC_word_t *vli, wordcount_t num_words);
+void uECC_vli_clear(uECC_word_t *vli);
 
 /*
  * @brief check if it is a valid point in the curve
diff --git a/tinycrypt/ecc.c b/tinycrypt/ecc.c
index 2846399..0039d2f 100644
--- a/tinycrypt/ecc.c
+++ b/tinycrypt/ecc.c
@@ -96,10 +96,10 @@
 	return 2 * curve->num_bytes;
 }
 
-void uECC_vli_clear(uECC_word_t *vli, wordcount_t num_words)
+void uECC_vli_clear(uECC_word_t *vli)
 {
 	wordcount_t i;
-	for (i = 0; i < num_words; ++i) {
+	for (i = 0; i < NUM_ECC_WORDS; ++i) {
 		 vli[i] = 0;
 	}
 }
@@ -465,7 +465,7 @@
 	wordcount_t word_shift = shift / uECC_WORD_BITS;
 	wordcount_t bit_shift = shift % uECC_WORD_BITS;
 	uECC_word_t carry = 0;
-	uECC_vli_clear(mod_multiple, word_shift);
+	uECC_vli_clear(mod_multiple);
 	if (bit_shift > 0) {
 		for(index = 0; index < (uECC_word_t)num_words; ++index) {
 			mod_multiple[word_shift + index] = (mod[index] << bit_shift) | carry;
@@ -545,15 +545,15 @@
 	cmpresult_t cmpResult;
 
 	if (uECC_vli_isZero(input)) {
-		uECC_vli_clear(result, num_words);
+		uECC_vli_clear(result);
 		return;
 	}
 
 	uECC_vli_set(a, input, num_words);
 	uECC_vli_set(b, mod, num_words);
-	uECC_vli_clear(u, num_words);
+	uECC_vli_clear(u);
 	u[0] = 1;
-	uECC_vli_clear(v, num_words);
+	uECC_vli_clear(v);
 	while ((cmpResult = uECC_vli_cmp_unsafe(a, b, num_words)) != 0) {
 		if (EVEN(a)) {
 			uECC_vli_rshift1(a, num_words);
@@ -778,7 +778,7 @@
 	if (initial_Z) {
 		uECC_vli_set(z, initial_Z, num_words);
 	} else {
-		uECC_vli_clear(z, num_words);
+		uECC_vli_clear(z);
 		z[0] = 1;
 	}
 
@@ -1016,7 +1016,7 @@
 			    int num_bytes)
 {
 	wordcount_t i;
-	uECC_vli_clear(native, (num_bytes + (uECC_WORD_SIZE - 1)) / uECC_WORD_SIZE);
+	uECC_vli_clear(native);
 	for (i = 0; i < num_bytes; ++i) {
 		unsigned b = num_bytes - 1 - i;
 		native[b / uECC_WORD_SIZE] |=
diff --git a/tinycrypt/ecc_dsa.c b/tinycrypt/ecc_dsa.c
index 8c32ee8..67b4ac7 100644
--- a/tinycrypt/ecc_dsa.c
+++ b/tinycrypt/ecc_dsa.c
@@ -87,7 +87,7 @@
 		bits_size = num_n_bytes;
 	}
 
-	uECC_vli_clear(native, num_n_words);
+	uECC_vli_clear(native);
 	uECC_vli_bytesToNative(native, bits, bits_size);
 	if (bits_size * 8 <= (unsigned)curve->num_n_bits) {
 		return;
@@ -134,7 +134,7 @@
 	/* If an RNG function was specified, get a random number
 	to prevent side channel analysis of k. */
 	if (!g_rng_function) {
-		uECC_vli_clear(tmp, num_n_words);
+		uECC_vli_clear(tmp);
 		tmp[0] = 1;
 	}
 	else if (!uECC_generate_random_int(tmp, curve->n, num_n_words)) {
@@ -271,7 +271,7 @@
                        ((!!uECC_vli_testBit(u2, num_bits - 1)) << 1)];
 	uECC_vli_set(rx, point, num_words);
 	uECC_vli_set(ry, point + num_words, num_words);
-	uECC_vli_clear(z, num_words);
+	uECC_vli_clear(z);
 	z[0] = 1;
 
 	for (i = num_bits - 2; i >= 0; --i) {