diff --git a/vlib/bignum/bignum.v b/vlib/bignum/bignum.v
index 060fc642cb..da71a02125 100644
--- a/vlib/bignum/bignum.v
+++ b/vlib/bignum/bignum.v
@@ -126,7 +126,7 @@ pub fn cmp(a Number, b Number) int {
 	return C.bignum_cmp(&a,&b)
 }
 pub fn (a Number) is_zero() bool {
-	return int(C.bignum_is_zero(&a)) != 0
+	return C.bignum_is_zero(&a) != 0
 }
 pub fn (a mut Number) inc() {
 	C.bignum_inc(a)
diff --git a/vlib/crypto/sha512/sha512.v b/vlib/crypto/sha512/sha512.v
index 1278d564ef..5bcaa0fc92 100644
--- a/vlib/crypto/sha512/sha512.v
+++ b/vlib/crypto/sha512/sha512.v
@@ -27,7 +27,7 @@ pub const (
 )
 
 const (
-	Chunk = 128
+	chunk = 128
 	init0 = 0x6a09e667f3bcc908
 	init1 = 0xbb67ae8584caa73b
 	init2 = 0x3c6ef372fe94f82b
@@ -73,7 +73,7 @@ mut:
 
 fn (d mut Digest) reset() {
 	d.h = [u64(0)].repeat(8)
-	d.x = [byte(0)].repeat(Chunk)
+	d.x = [byte(0)].repeat(chunk)
 	match d.function {
 		.sha384 {
 			d.h[0] = init0_384
@@ -155,7 +155,7 @@ fn (d mut Digest) write(p_ []byte) int {
 	if d.nx > 0 {
 		n := copy(d.x[d.nx..], p)
 		d.nx += n
-		if d.nx == Chunk {
+		if d.nx == chunk{
 			block(mut d, d.x)
 			d.nx = 0
 		}
@@ -166,8 +166,8 @@ fn (d mut Digest) write(p_ []byte) int {
 			p = p[n..]
 		}
 	}
-	if p.len >= Chunk {
-		n := p.len & ~(Chunk - 1)
+	if p.len >= chunk{
+		n := p.len & ~(chunk- 1)
 		block(mut d, p[..n])
 		if n >= p.len {
 			p = []
diff --git a/vlib/crypto/sha512/sha512block_generic.v b/vlib/crypto/sha512/sha512block_generic.v
index b28cc9e222..134442be30 100644
--- a/vlib/crypto/sha512/sha512block_generic.v
+++ b/vlib/crypto/sha512/sha512block_generic.v
@@ -104,7 +104,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 	mut h5 := dig.h[5]
 	mut h6 := dig.h[6]
 	mut h7 := dig.h[7]
-	for p.len >= Chunk {
+	for p.len >= chunk {
 		for i in 0..16 {
 			j := i * 8
 			w[i] = (u64(p[j])<<56) | (u64(p[j + 1])<<48) | (u64(p[j + 2])<<40) | (u64(p[j + 3])<<32) | (u64(p[j + 4])<<24) | (u64(p[j + 5])<<16) | (u64(p[j + 6])<<8) | u64(p[j + 7])
@@ -144,11 +144,11 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		h5 += f
 		h6 += g
 		h7 += h
-		if Chunk >= p.len {
+		if chunk >= p.len {
 			p = []
 		}
 		else {
-			p = p[Chunk..]
+			p = p[chunk..]
 		}
 	}
 	dig.h[0] = h0