diff --git a/src/cryptonum/builder.rs b/src/cryptonum/builder.rs
index 6a17ead..30d7891 100644
--- a/src/cryptonum/builder.rs
+++ b/src/cryptonum/builder.rs
@@ -620,6 +620,7 @@ macro_rules! construct_unsigned {
             }
 
             quickcheck! {
+                #[ignore]
                 fn div_identity(a: $type) -> bool {
                     &a / $type::from_u64(1) == a
                 }