diff --git a/tinycrypt/ecc.c b/tinycrypt/ecc.c
index cfdbc4b..c43ee72 100644
--- a/tinycrypt/ecc.c
+++ b/tinycrypt/ecc.c
@@ -88,7 +88,8 @@
 
 int uECC_curve_private_key_size(uECC_Curve curve)
 {
-	return BITS_TO_BYTES(curve->num_n_bits);
+	(void) curve;
+	return BITS_TO_BYTES(NUM_ECC_BITS);
 }
 
 int uECC_curve_public_key_size(uECC_Curve curve)
@@ -1094,7 +1095,7 @@
 	uECC_vli_bytesToNative(
 	_private,
 	private_key,
-	BITS_TO_BYTES(curve->num_n_bits));
+	BITS_TO_BYTES(NUM_ECC_BITS));
 
 	/* Make sure the private key is in the range [1, n-1]. */
 	if (uECC_vli_isZero(_private)) {
diff --git a/tinycrypt/ecc_dh.c b/tinycrypt/ecc_dh.c
index a1d7483..5c5bc13 100644
--- a/tinycrypt/ecc_dh.c
+++ b/tinycrypt/ecc_dh.c
@@ -89,7 +89,7 @@
 
 		/* Converting buffers to correct bit order: */
 		uECC_vli_nativeToBytes(private_key,
-				       BITS_TO_BYTES(curve->num_n_bits),
+				       BITS_TO_BYTES(NUM_ECC_BITS),
 				       _private);
 		uECC_vli_nativeToBytes(public_key,
 				       NUM_ECC_BYTES,
@@ -130,7 +130,7 @@
 
 			/* Converting buffers to correct bit order: */
 			uECC_vli_nativeToBytes(private_key,
-					       BITS_TO_BYTES(curve->num_n_bits),
+					       BITS_TO_BYTES(NUM_ECC_BITS),
 					       _private);
 			uECC_vli_nativeToBytes(public_key,
 					       NUM_ECC_BYTES,
@@ -161,7 +161,7 @@
 	/* Converting buffers to correct bit order: */
 	uECC_vli_bytesToNative(_private,
       			       private_key,
-			       BITS_TO_BYTES(curve->num_n_bits));
+			       BITS_TO_BYTES(NUM_ECC_BITS));
 	uECC_vli_bytesToNative(_public,
       			       public_key,
 			       num_bytes);
diff --git a/tinycrypt/ecc_dsa.c b/tinycrypt/ecc_dsa.c
index 5c4ca15..591c880 100644
--- a/tinycrypt/ecc_dsa.c
+++ b/tinycrypt/ecc_dsa.c
@@ -78,8 +78,8 @@
 static void bits2int(uECC_word_t *native, const uint8_t *bits,
 		     unsigned bits_size, uECC_Curve curve)
 {
-	unsigned num_n_bytes = BITS_TO_BYTES(curve->num_n_bits);
-	unsigned num_n_words = BITS_TO_WORDS(curve->num_n_bits);
+	unsigned num_n_bytes = BITS_TO_BYTES(NUM_ECC_BITS);
+	unsigned num_n_words = BITS_TO_WORDS(NUM_ECC_BITS);
 	int shift;
 	uECC_word_t carry;
 	uECC_word_t *ptr;
@@ -90,10 +90,10 @@
 
 	uECC_vli_clear(native);
 	uECC_vli_bytesToNative(native, bits, bits_size);
-	if (bits_size * 8 <= (unsigned)curve->num_n_bits) {
+	if (bits_size * 8 <= (unsigned)NUM_ECC_BITS) {
 		return;
 	}
-	shift = bits_size * 8 - curve->num_n_bits;
+	shift = bits_size * 8 - NUM_ECC_BITS;
 	carry = 0;
 	ptr = native + num_n_words;
 	while (ptr-- > native) {
@@ -116,7 +116,7 @@
 	uECC_word_t tmp[NUM_ECC_WORDS];
 	uECC_word_t s[NUM_ECC_WORDS];
 	uECC_word_t p[NUM_ECC_WORDS * 2];
-	wordcount_t num_n_words = BITS_TO_WORDS(curve->num_n_bits);
+	wordcount_t num_n_words = BITS_TO_WORDS(NUM_ECC_BITS);
 	int r;
 
 
@@ -150,7 +150,7 @@
 	uECC_vli_nativeToBytes(signature, NUM_ECC_BYTES, p); /* store r */
 
 	/* tmp = d: */
-	uECC_vli_bytesToNative(tmp, private_key, BITS_TO_BYTES(curve->num_n_bits));
+	uECC_vli_bytesToNative(tmp, private_key, BITS_TO_BYTES(NUM_ECC_BITS));
 
 	s[num_n_words - 1] = 0;
 	uECC_vli_set(s, p);
@@ -220,7 +220,7 @@
 	uECC_word_t _public[NUM_ECC_WORDS * 2];
 	uECC_word_t r[NUM_ECC_WORDS], s[NUM_ECC_WORDS];
 	wordcount_t num_words = NUM_ECC_WORDS;
-	wordcount_t num_n_words = BITS_TO_WORDS(curve->num_n_bits);
+	wordcount_t num_n_words = BITS_TO_WORDS(NUM_ECC_BITS);
 
 	if (curve != uECC_secp256r1())
 		return 0;