diff --git a/allocative/src/impls/std/primitive.rs b/allocative/src/impls/std/primitive.rs
index f334039..ef88202 100644
--- a/allocative/src/impls/std/primitive.rs
+++ b/allocative/src/impls/std/primitive.rs
@@ -35,6 +35,12 @@ impl Allocative for u64 {
     }
 }
 
+impl Allocative for u128 {
+    fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
+        visitor.visit_simple_sized::<Self>();
+    }
+}
+
 impl Allocative for usize {
     fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
         visitor.visit_simple_sized::<Self>();
@@ -65,6 +71,12 @@ impl Allocative for i64 {
     }
 }
 
+impl Allocative for i128 {
+    fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
+        visitor.visit_simple_sized::<Self>();
+    }
+}
+
 impl Allocative for isize {
     fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
         visitor.visit_simple_sized::<Self>();