diff --git a/src/uint/extra_sizes.rs b/src/uint/extra_sizes.rs
index fb639c71..d6ff5aa3 100644
--- a/src/uint/extra_sizes.rs
+++ b/src/uint/extra_sizes.rs
@@ -108,7 +108,9 @@ impl_uint_aliases! {
     (U7936, 7936, "7936-bit"),
     (U8000, 8000, "8000-bit"),
     (U8064, 8064, "8064-bit"),
-    (U8128, 8128, "8128-bit")
+    (U8128, 8128, "8128-bit"),
+    (U8320, 8320, "8320-bit"),
+    (U12288, 12288, "12288-bit")
 }
 
 impl_uint_concat_split_even! {
@@ -157,4 +159,6 @@ impl_uint_concat_split_even! {
     U7808,
     U7936,
     U8064,
+    U8320,
+    U12288,
 }