diff --git a/src/uint.rs b/src/uint.rs
index b673aa6da..c54e553a6 100644
--- a/src/uint.rs
+++ b/src/uint.rs
@@ -357,6 +357,8 @@ impl_uint_aliases! {
     (U3072, 3072, "3072-bit"),
     (U3584, 3584, "3584-bit"),
     (U4096, 4096, "4096-bit"),
+    (U4224, 4224, "4224-bit"),
+    (U4352, 4352, "4352-bit"),
     (U6144, 6144, "6144-bit"),
     (U8192, 8192, "8192-bit")
 }
@@ -385,7 +387,9 @@ impl_concat! {
     (U1792, 1792),
     (U2048, 2048),
     (U3072, 3072),
-    (U4096, 4096)
+    (U4096, 4096),
+    (U4224, 4224),
+    (U4352, 4352)
 }
 
 // TODO(tarcieri): use `const_evaluatable_checked` when stable to make generic around bits.
@@ -405,6 +409,8 @@ impl_split! {
     (U3072, 3072),
     (U3584, 3584),
     (U4096, 4096),
+    (U4224, 4224),
+    (U4352, 4352),
     (U6144, 6144),
     (U8192, 8192)
 }
diff --git a/src/uint/extra_sizes.rs b/src/uint/extra_sizes.rs
index 116802735..0d5d00fd7 100644
--- a/src/uint/extra_sizes.rs
+++ b/src/uint/extra_sizes.rs
@@ -53,9 +53,7 @@ impl_uint_aliases! {
     (U3968, 3968, "3968-bit"),
     (U4032, 4032, "4032-bit"),
     (U4160, 4160, "4160-bit"),
-    (U4224, 4224, "4224-bit"),
     (U4288, 4288, "4288-bit"),
-    (U4352, 4352, "4352-bit"),
     (U4416, 4416, "4416-bit"),
     (U4480, 4480, "4480-bit"),
     (U4544, 4544, "4544-bit"),
@@ -165,9 +163,7 @@ impl_concat! {
     (U3968, 3968),
     (U4032, 4032),
     (U4160, 4160),
-    (U4224, 4224),
     (U4288, 4288),
-    (U4352, 4352),
     (U4416, 4416),
     (U4480, 4480),
     (U4544, 4544),
@@ -248,8 +244,6 @@ impl_split! {
     (U3712, 3712),
     (U3840, 3840),
     (U3968, 3968),
-    (U4224, 4224),
-    (U4352, 4352),
     (U4480, 4480),
     (U4608, 4608),
     (U4736, 4736),