diff --git a/crates/lexer/src/lib.rs b/crates/lexer/src/lib.rs
index 1f632dd..a2af80f 100644
--- a/crates/lexer/src/lib.rs
+++ b/crates/lexer/src/lib.rs
@@ -188,6 +188,16 @@ tokens!(pub Token: {
         F64 => "f64",
         ISize => "isize",
         USize => "usize",
+        U1 => "u1",
+        U8 => "u8",
+        U16 => "u16",
+        U32 => "u32",
+        U64 => "u64",
+        I1 => "i1",
+        I8 => "i8",
+        I16 => "i16",
+        I32 => "i32",
+        I64 => "i64",
         Const => "const",
         Volatile => "volatile",
         Noalias => "noalias",
@@ -666,7 +676,7 @@ mod tests {
         assert_eq!(lexer.next(), Some((Token::OpenParens, "(")));
         assert_eq!(lexer.next(), Some((Token::Ident, "x")));
         assert_eq!(lexer.next(), Some((Token::Colon, ":")));
-        assert_eq!(lexer.next(), Some((Token::Ident, "i32")));
+        assert_eq!(lexer.next(), Some((Token::I32, "i32")));
         assert_eq!(lexer.next(), Some((Token::Comma, ",")));
         assert_eq!(lexer.next(), Some((Token::Ident, "y")));
         assert_eq!(lexer.next(), Some((Token::Colon, ":")));