diff --git a/src/math.rs b/src/math.rs
index ca1af9f..c336ed7 100644
--- a/src/math.rs
+++ b/src/math.rs
@@ -12,7 +12,7 @@ macro_rules! define_binary_op {
             let $left = tree.pull_by_stack_code((stack_code & 0b100) >> 2);
             let $right = tree.pull_by_stack_code((stack_code & 0b010) >> 1);
 
-            let $right = if !use_literal { $left } else { literal };
+            let $right = if !use_literal { $right } else { literal };
 
             if is_signed {
                 let $left = $left as i16;