diff --git a/clippy_lints/src/array_indexing.rs b/clippy_lints/src/array_indexing.rs
index de13c0264e5..f14268f9b4c 100644
--- a/clippy_lints/src/array_indexing.rs
+++ b/clippy_lints/src/array_indexing.rs
@@ -61,7 +61,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ArrayIndexing {
             // Array with known size can be checked statically
             let ty = cx.tcx.tables().expr_ty(array);
             if let ty::TyArray(_, size) = ty.sty {
-                let size = ConstInt::Infer(size as u64);
+                let size = ConstInt::Infer(size as u128);
 
                 // Index is a constant uint
                 let const_index = eval_const_expr_partial(cx.tcx, index, ExprTypeChecked, None);
diff --git a/clippy_lints/src/bit_mask.rs b/clippy_lints/src/bit_mask.rs
index 5b860d8cedc..1323ce29875 100644
--- a/clippy_lints/src/bit_mask.rs
+++ b/clippy_lints/src/bit_mask.rs
@@ -106,7 +106,7 @@ fn invert_cmp(cmp: BinOp_) -> BinOp_ {
 }
 
 
-fn check_compare(cx: &LateContext, bit_op: &Expr, cmp_op: BinOp_, cmp_value: u64, span: &Span) {
+fn check_compare(cx: &LateContext, bit_op: &Expr, cmp_op: BinOp_, cmp_value: u128, span: &Span) {
     if let ExprBinary(ref op, ref left, ref right) = bit_op.node {
         if op.node != BiBitAnd && op.node != BiBitOr {
             return;
@@ -117,7 +117,7 @@ fn check_compare(cx: &LateContext, bit_op: &Expr, cmp_op: BinOp_, cmp_value: u64
     }
 }
 
-fn check_bit_mask(cx: &LateContext, bit_op: BinOp_, cmp_op: BinOp_, mask_value: u64, cmp_value: u64, span: &Span) {
+fn check_bit_mask(cx: &LateContext, bit_op: BinOp_, cmp_op: BinOp_, mask_value: u128, cmp_value: u128, span: &Span) {
     match cmp_op {
         BiEq | BiNe => {
             match bit_op {
@@ -212,7 +212,7 @@ fn check_bit_mask(cx: &LateContext, bit_op: BinOp_, cmp_op: BinOp_, mask_value:
     }
 }
 
-fn check_ineffective_lt(cx: &LateContext, span: Span, m: u64, c: u64, op: &str) {
+fn check_ineffective_lt(cx: &LateContext, span: Span, m: u128, c: u128, op: &str) {
     if c.is_power_of_two() && m < c {
         span_lint(cx,
                   INEFFECTIVE_BIT_MASK,
@@ -224,7 +224,7 @@ fn check_ineffective_lt(cx: &LateContext, span: Span, m: u64, c: u64, op: &str)
     }
 }
 
-fn check_ineffective_gt(cx: &LateContext, span: Span, m: u64, c: u64, op: &str) {
+fn check_ineffective_gt(cx: &LateContext, span: Span, m: u128, c: u128, op: &str) {
     if (c + 1).is_power_of_two() && m <= c {
         span_lint(cx,
                   INEFFECTIVE_BIT_MASK,
@@ -236,7 +236,7 @@ fn check_ineffective_gt(cx: &LateContext, span: Span, m: u64, c: u64, op: &str)
     }
 }
 
-fn fetch_int_literal(cx: &LateContext, lit: &Expr) -> Option<u64> {
+fn fetch_int_literal(cx: &LateContext, lit: &Expr) -> Option<u128> {
     match lit.node {
         ExprLit(ref lit_ptr) => {
             if let LitKind::Int(value, _) = lit_ptr.node {
diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs
index cb73d419eb2..890baa64d23 100644
--- a/clippy_lints/src/consts.rs
+++ b/clippy_lints/src/consts.rs
@@ -74,7 +74,7 @@ impl PartialEq for Constant {
             (&Constant::Binary(ref l), &Constant::Binary(ref r)) => l == r,
             (&Constant::Char(l), &Constant::Char(r)) => l == r,
             (&Constant::Int(l), &Constant::Int(r)) => {
-                l.is_negative() == r.is_negative() && l.to_u64_unchecked() == r.to_u64_unchecked()
+                l.is_negative() == r.is_negative() && l.to_u128_unchecked() == r.to_u128_unchecked()
             },
             (&Constant::Float(ref ls, _), &Constant::Float(ref rs, _)) => {
                 // we want `Fw32 == FwAny` and `FwAny == Fw64`, by transitivity we must have
@@ -110,7 +110,7 @@ impl Hash for Constant {
                 c.hash(state);
             },
             Constant::Int(i) => {
-                i.to_u64_unchecked().hash(state);
+                i.to_u128_unchecked().hash(state);
                 i.is_negative().hash(state);
             },
             Constant::Float(ref f, _) => {
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index ac92d5ec97b..b902d18d184 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -3,6 +3,7 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(custom_attribute)]
+#![feature(i128_type)]
 #![feature(rustc_private)]
 #![feature(slice_patterns)]
 #![feature(stmt_expr_attributes)]
diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index e9c77f027e8..102074ca15a 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -611,7 +611,7 @@ pub fn walk_ptrs_ty_depth(ty: ty::Ty) -> (ty::Ty, usize) {
 }
 
 /// Check whether the given expression is a constant literal of the given value.
-pub fn is_integer_literal(expr: &Expr, value: u64) -> bool {
+pub fn is_integer_literal(expr: &Expr, value: u128) -> bool {
     // FIXME: use constant folding
     if let ExprLit(ref spanned) = expr.node {
         if let LitKind::Int(v, _) = spanned.node {