diff --git a/Cargo.toml b/Cargo.toml
index 4c76c63..bac829e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ repository = "https://github.com/ebfull/pairing"
 [dependencies]
 rand = "0.3"
 byteorder = "1.1.0"
-clippy = { version = "0.0.151", optional = true }
+clippy = { version = "0.0.165", optional = true }
 
 [features]
 unstable-features = []
diff --git a/src/lib.rs b/src/lib.rs
index dc5d330..8b80ef3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,6 +13,7 @@
 #![cfg_attr(feature = "clippy", allow(too_many_arguments))]
 #![cfg_attr(feature = "clippy", allow(unreadable_literal))]
 #![cfg_attr(feature = "clippy", allow(new_without_default_derive))]
+#![cfg_attr(feature = "clippy", allow(expl_impl_clone_on_copy))] // TODO
 
 // Force public structures to implement Debug
 #![deny(missing_debug_implementations)]
@@ -519,7 +520,7 @@ pub trait PrimeField: Field
                     }
 
                     res.mul_assign(&ten);
-                    res.add_assign(&Self::from_repr(Self::Repr::from(c as u64)).unwrap());
+                    res.add_assign(&Self::from_repr(Self::Repr::from(u64::from(c))).unwrap());
                 },
                 None => {
                     return None;