diff --git a/cast_test.go b/cast_test.go
index 6bea164..409b7d9 100644
--- a/cast_test.go
+++ b/cast_test.go
@@ -47,6 +47,7 @@ func createNumberTestSteps(zero, one, eight, eightnegative, eightpoint31, eightp
 		{int16(8), eight, false},
 		{int32(8), eight, false},
 		{int64(8), eight, false},
+		{eightAliasType, eight, false},
 		{time.Weekday(8), eight, false},
 		{time.Month(8), eight, false},
 		{uint(8), eight, false},
@@ -1221,3 +1222,9 @@ func locationEqual(a, b *time.Location) bool {
 
 	return tA.Equal(tB)
 }
+
+type BizType int
+
+const (
+	eightAliasType BizType = 8
+)