diff --git a/src/sizes.rs b/src/sizes.rs
index 276afa6..24c2d50 100644
--- a/src/sizes.rs
+++ b/src/sizes.rs
@@ -1176,4 +1176,30 @@ mod extra_sizes {
         8978 => U8978,
         14421 => U14421,
     }
+
+    // Classic McEliece sizes
+    pub type U6492 = uint!(0 0 1 1 1 0 1 0 1 0 0 1 1);
+    pub type U13608 = uint!(0 0 0 1 0 1 0 0 1 0 1 0 1 1);
+    pub type U13932 = uint!(0 0 1 1 0 1 1 0 0 1 1 0 1 1);
+    pub type U13948 = uint!(0 0 1 1 1 1 1 0 0 1 1 0 1 1);
+    pub type U14120 = uint!(0 0 0 1 0 1 0 0 1 1 1 0 1 1);
+    pub type U261120 = uint!(0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1);
+    pub type U524160 = uint!(0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1);
+    pub type U1044992 = uint!(0 0 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 1 1 1);
+    pub type U1047319 = uint!(1 1 1 0 1 0 0 0 1 1 0 1 1 1 1 1 1 1 1 1);
+    pub type U1357824 = uint!(0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1 0 0 1 0 1);
+
+    impl_array_sizes! {
+        classic_mceliece,
+        6492 => U6492,
+        13608 => U13608,
+        13932 => U13932,
+        13948 => U13948,
+        14120 => U14120,
+        261120 => U261120,
+        524160 => U524160,
+        1044992 => U1044992,
+        1047319 => U1047319,
+        1357824 => U1357824,
+    }
 }