diff --git a/src/ast/optimization.rs b/src/ast/optimization.rs
index 398f241..b269d5d 100644
--- a/src/ast/optimization.rs
+++ b/src/ast/optimization.rs
@@ -29,6 +29,7 @@ pub fn bubble_binop_vars(expr: TypedExpr) -> TypedExpr {
             let rhs = *rhs;
 
             let lhs = bubble_binop_vars(lhs);
+            let rhs = bubble_binop_vars(rhs);
 
             let (lhs, rhs, op, rebubble) = match (lhs, rhs) {
                 (