diff --git a/vlib/builtin/int.v b/vlib/builtin/int.v
index 42486816cb..8881bb5900 100644
--- a/vlib/builtin/int.v
+++ b/vlib/builtin/int.v
@@ -156,16 +156,16 @@ pub fn (n i64) hex() string {
 	len := if n >= i64(0) { n.str().len + 3 } else { 19 }
 	hex := malloc(len)
 	// QTODO
-	//count := C.sprintf(charptr(hex), '0x%'C.PRIx64, n)
-	count := C.sprintf(charptr(hex), '0x%x', n)
+	count := C.sprintf(charptr(hex), '0x%'C.PRIx64, n)
+	//count := C.sprintf(charptr(hex), '0x%x', n)
 	return tos(hex, count)
 }
 
 pub fn (n u64) hex() string {
 	len := if n >= u64(0) { n.str().len + 3 } else { 19 }
 	hex := malloc(len)
-	//count := C.sprintf(charptr(hex), '0x%'C.PRIx64, n)
-	count := C.sprintf(charptr(hex), '0x%lx', n)
+	count := C.sprintf(charptr(hex), '0x%'C.PRIx64, n)
+	//count := C.sprintf(charptr(hex), '0x%lx', n)
 	return tos(hex, count)
 }