1 files changed, 6 insertions, 0 deletions
diff --git a/crates/typst-syntax/src/lexer.rs b/crates/typst-syntax/src/lexer.rs
index 1314016f..358c25b2 100644
--- a/crates/typst-syntax/src/lexer.rs
+++ b/crates/typst-syntax/src/lexer.rs
@@ -766,6 +766,12 @@ impl Lexer<'_> {
             return self.error(eco_format!("invalid number suffix: {}", suffix));
         }
 
+        if base != 10 {
+            let kind = self.error(eco_format!("invalid base-{base} prefix"));
+            self.hint("numbers with a unit cannot have a base prefix");
+            return kind;
+        }
+
         SyntaxKind::Numeric
     }