diff --git a/src/fn/hof.md b/src/fn/hof.md
index 9be5b41fec..705881593a 100644
--- a/src/fn/hof.md
+++ b/src/fn/hof.md
@@ -26,18 +26,17 @@ fn main() {
             break;
         } else if is_odd(n_squared) {
             // Accumulate value, if it's odd
-            acc += n_squared;
+            acc += n;
         }
     }
     println!("imperative style: {}", acc);
 
     // Functional approach
-    let sum_of_squared_odd_numbers: u32 =
-        (0..).map(|n| n * n)                             // All natural numbers squared
-             .take_while(|&n_squared| n_squared < upper) // Below upper limit
-             .filter(|&n_squared| is_odd(n_squared))     // That are odd
-             .sum();                                     // Sum them
-    println!("functional style: {}", sum_of_squared_odd_numbers);
+    let sum: u32 =
+        (0..).take_while(|&n| n * n < upper) // Below upper limit
+             .filter(|&n| is_odd(n * n))     // That are odd
+             .sum();                         // Sum them
+    println!("functional style: {}", sum);
 }
 ```