diff --git a/crates/generate/src/build_tables.rs b/crates/generate/src/build_tables.rs
index ea61834d..f5709419 100644
--- a/crates/generate/src/build_tables.rs
+++ b/crates/generate/src/build_tables.rs
@@ -334,7 +334,7 @@ fn identify_keywords(
         .enumerate()
         .filter_map(|(i, variable)| {
             cursor.reset(vec![variable.start_state]);
-            if all_chars_are_valid_for_keywords(&cursor)
+            if all_chars_are_alphabetical(&cursor)
                 && token_conflict_map.does_match_same_string(i, word_token.index)
                 && !token_conflict_map.does_match_different_string(i, word_token.index)
             {
@@ -531,17 +531,12 @@ fn report_state_info<'a>(
     }
 }
 
-/// This definition should match the set of characters that are typically
-/// allowed in programming language keywords. Note that it is provisional,
-/// and can be adjusted if necessary.
-fn all_chars_are_valid_for_keywords(cursor: &NfaCursor) -> bool {
+fn all_chars_are_alphabetical(cursor: &NfaCursor) -> bool {
     cursor.transition_chars().all(|(chars, is_sep)| {
         if is_sep {
             true
         } else {
-            chars
-                .chars()
-                .all(|c| c.is_alphanumeric() || "_!@#$-:.?/`".contains(c))
+            chars.chars().all(|c| c.is_alphabetic() || c == '_')
         }
     })
 }