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