diff --git a/vlib/builtin/int.v b/vlib/builtin/int.v
index f7e97ef8bc..fda2dc3cc8 100644
--- a/vlib/builtin/int.v
+++ b/vlib/builtin/int.v
@@ -76,11 +76,6 @@ pub fn (nn u32) str() string {
 	max := 16
 	mut buf := malloc(max)
 	mut len := 0
-	mut is_neg := false
-	if n < u32(0) {
-		n = -n
-		is_neg = true
-	}
 	// Fill the string from the end
 	for n > u32(0) {
 		d := n % u32(10)
@@ -88,11 +83,6 @@ pub fn (nn u32) str() string {
 		len++
 		n = n / u32(10)
 	}
-	// Prepend - if it's negative
-	if is_neg {
-		buf[max - len - 1] = `-`
-		len++
-	}
 	return tos(buf + max - len, len)
 }
 
@@ -104,11 +94,6 @@ pub fn (nn u8) str() string {
 	max := 5
 	mut buf := malloc(max)
 	mut len := 0
-	mut is_neg := false
-	if n < u8(0) {
-		n = -n
-		is_neg = true
-	}
 	// Fill the string from the end
 	for n > u8(0) {
 		d := n % u8(10)
@@ -116,11 +101,6 @@ pub fn (nn u8) str() string {
 		len++
 		n = n / u8(10)
 	}
-	// Prepend - if it's negative
-	if is_neg {
-		buf[max - len - 1] = `-`
-		len++
-	}
 	return tos(buf + max - len, len)
 }
 
@@ -160,11 +140,6 @@ pub fn (nn u64) str() string {
 	max := 32
 	mut buf := malloc(max)
 	mut len := 0
-	mut is_neg := false
-	if n < u64(0) {
-		n = -n
-		is_neg = true
-	}
 	// Fill the string from the end
 	for n > u64(0) {
 		d := n % u64(10)
@@ -172,11 +147,6 @@ pub fn (nn u64) str() string {
 		len++
 		n = n / u64(10)
 	}
-	// Prepend - if it's negative
-	if is_neg {
-		buf[max - len - 1] = `-`
-		len++
-	}
 	return tos(buf + max - len, len)
 }