diff --git a/fixed_wide/src/tests.rs b/fixed_wide/src/tests.rs
index 17c1ce3..8e4dd4e 100644
--- a/fixed_wide/src/tests.rs
+++ b/fixed_wide/src/tests.rs
@@ -86,6 +86,8 @@ fn test_bint(){
 fn test_fix(){
 	assert_eq!(I32F32::ONE.fix_8(),I256F256::ONE);
 	assert_eq!(I32F32::ONE,I256F256::ONE.fix_1());
+	assert_eq!(I32F32::NEG_ONE.fix_8(),I256F256::NEG_ONE);
+	assert_eq!(I32F32::NEG_ONE,I256F256::NEG_ONE.fix_1());
 }
 #[test]
 fn test_sqrt(){