diff --git a/src/parser/ast.rs b/src/parser/ast.rs
index afd1fce..b061d0f 100644
--- a/src/parser/ast.rs
+++ b/src/parser/ast.rs
@@ -645,13 +645,12 @@ pub mod canonical {
                     Expr::Number(tail)
                 }
                 Expr::Binary(head, tails) => {
+                    let mut tails = tails.into_iter().map(|(op, tail)| (op, tail.to_canonical()));
                     let mut head = match head.to_canonical() {
                         Expr::Number(n) => n,
-                        head => return Expr::Binary(head.into(), tails),
+                        head => return Expr::Binary(head.into(), tails.collect()),
                     };
-                    let mut tails = tails.into_iter();
                     for (op, tail) in &mut tails {
-                        let tail = tail.to_canonical();
                         // If the canonical tail isn't a number, rebuild and return
                         let Expr::Number(tail) = tail else {
                             return Expr::Binary(