diff --git a/src/branch/mod.rs b/src/branch/mod.rs
index 20205f595..5c88df027 100644
--- a/src/branch/mod.rs
+++ b/src/branch/mod.rs
@@ -155,7 +155,7 @@ macro_rules! alt_trait_inner(
   );
 );
 
-alt_trait!(A B C D E F G H I J K L M N O P Q R S T U);
+alt_trait!(A B C D E F G H I J K L M N O P Q R S T U V W X Y Z AA AB AC AD);
 
 // Manually implement Alt for (A,), the 1-tuple type
 impl<Input, Output, Error: ParseError<Input>, A: Parser<Input, Output = Output, Error = Error>>
@@ -369,4 +369,13 @@ permutation_trait!(
   FnS S s
   FnT T t
   FnU U u
+  FnV V v
+  FnW W w
+  FnX X x
+  FnY Y y
+  FnZ Z z
+  FnAA AA aa
+  FnAB AB ab
+  FnAC AC ac
+  FnAD AD ad
 );
diff --git a/src/macros.rs b/src/macros.rs
index 980d2d90e..6bf3b5cf2 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -20,4 +20,13 @@ macro_rules! succ (
   (18, $submac:ident ! ($($rest:tt)*)) => ($submac!(19, $($rest)*));
   (19, $submac:ident ! ($($rest:tt)*)) => ($submac!(20, $($rest)*));
   (20, $submac:ident ! ($($rest:tt)*)) => ($submac!(21, $($rest)*));
+  (21, $submac:ident ! ($($rest:tt)*)) => ($submac!(22, $($rest)*));
+  (22, $submac:ident ! ($($rest:tt)*)) => ($submac!(23, $($rest)*));
+  (23, $submac:ident ! ($($rest:tt)*)) => ($submac!(24, $($rest)*));
+  (24, $submac:ident ! ($($rest:tt)*)) => ($submac!(25, $($rest)*));
+  (25, $submac:ident ! ($($rest:tt)*)) => ($submac!(26, $($rest)*));
+  (26, $submac:ident ! ($($rest:tt)*)) => ($submac!(27, $($rest)*));
+  (27, $submac:ident ! ($($rest:tt)*)) => ($submac!(28, $($rest)*));
+  (28, $submac:ident ! ($($rest:tt)*)) => ($submac!(29, $($rest)*));
+  (29, $submac:ident ! ($($rest:tt)*)) => ($submac!(30, $($rest)*));
 );