diff --git a/rust/adagio/src/lib.rs b/rust/adagio/src/lib.rs
--- a/rust/adagio/src/lib.rs
+++ b/rust/adagio/src/lib.rs
@@ -223,7 +223,7 @@

         while left_index < left_length && right_index < right_length {
             let ref left_term = left_terms[left_index];
-            let ref right_term = right_terms[right_length];
+            let ref right_term = right_terms[right_index];
             match left_term.fuzzy_cmp(right_term.as_ref()) {
                 Ordering::Less => {
                     terms.push(left_term.clone());
@@ -338,7 +338,7 @@
             assert!(left_index < left.len(), "Left OOB");
             assert!(right_index < right.len(), "Right OOB");
             println!("Right len: {} index: {}", right.len(), right_index);
-            let ref right_power = right[right_length];
+            let ref right_power = right[right_index];
             println!("Right indexing succeeded");
             println!("Left len: {} index: {} right len: {} index: {}",
                      left.len(),