diff --git a/rust/src/include/ranges.rs b/rust/src/include/ranges.rs
index 4ee4b838..b5b8cd40 100644
--- a/rust/src/include/ranges.rs
+++ b/rust/src/include/ranges.rs
@@ -14,7 +14,7 @@ where I: NumAssign + PartialOrd
     let length = if step > zero() && start < stop {
         one::<I>() + (stop - one() - start) / step
     } else if step < zero() && start > stop {
-        one::<I>() + (start - one() - stop) / (-step)
+        one::<I>() + (stop + one() - start) / step
     } else {
         zero::<I>()
     };
diff --git a/rust/src/problems/p0028.rs b/rust/src/problems/p0028.rs
index 3c17e06a..28716b13 100644
--- a/rust/src/problems/p0028.rs
+++ b/rust/src/problems/p0028.rs
@@ -52,11 +52,11 @@ use crate::include::utils::Answer;
 pub fn p0028() -> Answer {
     let mut answer: u32 = 1;
     for i in 1..(1002 / 2) {
-        let start = (2 * i - 1)**2 + 1;
-        answer += range_entry3(start, 1, (1 * 2 * i - 1)) +
-                  range_entry3(start, 1, (2 * 2 * i - 1)) +
-                  range_entry3(start, 1, (3 * 2 * i - 1)) +
-                  range_entry3(start, 1, (4 * 2 * i - 1));
+        let start = (2 * i - 1).pow(2) + 1;
+        answer += range_entry3(start, 1, 1 * 2 * i - 1) +
+                  range_entry3(start, 1, 2 * 2 * i - 1) +
+                  range_entry3(start, 1, 3 * 2 * i - 1) +
+                  range_entry3(start, 1, 4 * 2 * i - 1);
     }
     return Answer::Int(answer.into());
 }