diff --git a/src/utils.rs b/src/utils.rs
index 4a204da..5c7524d 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -375,7 +375,7 @@ pub(crate) fn eat_ident<I: Iterator<Item = Token>>(
                     return Err("Expected identifier.".into());
                 }
             }
-            '-' | '_' | _ if tok.kind.is_alphanumeric() => s.push(toks.next().unwrap().kind),
+            'a'..='z' | 'A'..='Z' | '0'..='9' | '-' | '_' => s.push(toks.next().unwrap().kind),
             '\\' => {
                 toks.next();
                 let mut n = String::new();
@@ -407,9 +407,6 @@ pub(crate) fn eat_ident<I: Iterator<Item = Token>>(
                     s.push(c);
                 };
             }
-            _ if !tok.kind.is_ascii() && !tok.kind.is_control() => {
-                s.push(toks.next().unwrap().kind)
-            }
             _ => break,
         }
     }
@@ -425,7 +422,7 @@ pub(crate) fn eat_ident_no_interpolation<I: Iterator<Item = Token>>(
             '#' => {
                 break;
             }
-            '-' | '_' | _ if tok.kind.is_alphanumeric() => s.push(toks.next().unwrap().kind),
+            'a'..='z' | 'A'..='Z' | '0'..='9' | '-' | '_' => s.push(toks.next().unwrap().kind),
             '\\' => {
                 s.push('\\');
                 toks.next();
@@ -439,9 +436,6 @@ pub(crate) fn eat_ident_no_interpolation<I: Iterator<Item = Token>>(
                     todo!()
                 }
             }
-            _ if !tok.kind.is_ascii() && !tok.kind.is_control() => {
-                s.push(toks.next().unwrap().kind)
-            }
             _ => break,
         }
     }
diff --git a/src/value/parse.rs b/src/value/parse.rs
index fac58f8..6741600 100644
--- a/src/value/parse.rs
+++ b/src/value/parse.rs
@@ -365,7 +365,7 @@ impl Value {
                     Ok(parse_hex(toks, scope, super_selector)?)
                 }
             }
-            '_' | '\\' | _ if kind.is_alphabetic() || (!kind.is_ascii() && !kind.is_control()) => {
+            'a'..='z' | 'A'..='Z' | '_' | '\\' => {
                 let mut s = eat_ident(toks, scope, super_selector)?;
                 match toks.peek() {
                     Some(Token { kind: '(', .. }) => {