diff --git a/vlib/builtin/int_test.v b/vlib/builtin/int_test.v
index d53bd44103..8bafd8fefe 100644
--- a/vlib/builtin/int_test.v
+++ b/vlib/builtin/int_test.v
@@ -29,8 +29,8 @@ fn test_str_methods() {
 	assert u64(-1).str() == '18446744073709551615'
 	assert voidptr(-1).str() == '0xffffffffffffffff'
 	assert voidptr(1).str() == '0x1'
-	assert (&u8(-1)).str() == 'ffffffffffffffff'
-	assert (&u8(1)).str() == '1'
+	assert (&u8(voidptr(-1))).str() == 'ffffffffffffffff'
+	assert (&u8(voidptr(1))).str() == '1'
 	assert byteptr(-1).str() == '0xffffffffffffffff'
 	assert byteptr(1).str() == '0x1'
 	assert charptr(-1).str() == '0xffffffffffffffff'